Illustration to show that if through any point in the bisector of an angle a line is drawn parallel to either of the sides of the angle, the triangle thus formed is isosceles.

Angle Bisector Drawn Parallel to A Side

Illustration to show that if through any point in the bisector of an angle a line is drawn parallel…

Illustration of two angles whose sides are parallel, each to each, to show they are either equal or supplementary.

Angles With Parallel Sides

Illustration of two angles whose sides are parallel, each to each, to show they are either equal or…

Illustration showing that the bisector of a given angle is the locus of points equidistant from the sides of the angle.

Angle Bisector

Illustration showing that the bisector of a given angle is the locus of points equidistant from the…

Illustration showing that the perpendicular bisector of a given line is the locus of points equidistant from the extremities of the line.

Perpendicular Bisector of a Line

Illustration showing that the perpendicular bisector of a given line is the locus of points equidistant…

This four sided bottle is a rigid container. A glass bottle is a bottle created from glass. Glass bottles can vary in size considerably.

Four Sided Bottle

This four sided bottle is a rigid container. A glass bottle is a bottle created from glass. Glass bottles…

An illustration of a cliff located in the Adirondacks.

Cliff

An illustration of a cliff located in the Adirondacks.

Illustration of the construction used to make a parallelogram when given two sides and the included angle.

Construction of a Parallelogram When Given Two Sides and Included Angle

Illustration of the construction used to make a parallelogram when given two sides and the included…

Illustration of the construction used to make a triangle when given three sides.

Construction of a Triangle When Given Three Sides

Illustration of the construction used to make a triangle when given three sides.

"Side view of built up armature core. The sheet metal ring sections containing the teeth are fastened into dovetail notches in the spider as shown." — Hawkins, 1917

Armature core

"Side view of built up armature core. The sheet metal ring sections containing the teeth are fastened…

An illustration of both sides of a U.S. Dime.

Both sides of a Dime

An illustration of both sides of a U.S. Dime.

An illustration of both sides of a U.S. Dime that can be cutout and folded.

Two Sided Dime

An illustration of both sides of a U.S. Dime that can be cutout and folded.

An illustration of both sides of a U.S. Dollar Coin.

Both sides of a Dollar

An illustration of both sides of a U.S. Dollar Coin.

An illustration of both sides of a U.S. Dollar Coin that can be cutout and folded.

Two Sided Dollar

An illustration of both sides of a U.S. Dollar Coin that can be cutout and folded.

"Partial sketch of a four pole machine laid on its side." -Hawkins, 1917

Four Pole Machine

"Partial sketch of a four pole machine laid on its side." -Hawkins, 1917

An illustration of both sides of a U.S. Half Dollar.

Both sides of a Half Dollar

An illustration of both sides of a U.S. Half Dollar.

An illustration of both sides of a U.S. Half Dollar that can be cutout and folded.

Two Sided Half Dollar

An illustration of both sides of a U.S. Half Dollar that can be cutout and folded.

An illustration of the side of a large house.

House (Side)

An illustration of the side of a large house.

An extra strip of material put inside a shoe for comfort or protection.

Shoe Insole

An extra strip of material put inside a shoe for comfort or protection.

Labeled shapes showing various measures of form.

Measures of Form

Labeled shapes showing various measures of form.

An illustration of both sides of a U.S. Nickle.

Both sides of a Nickel

An illustration of both sides of a U.S. Nickle.

An illustration of both sides of a U.S. Nickle that can be cutout and folded.

Two Sided Nickel

An illustration of both sides of a U.S. Nickle that can be cutout and folded.

An illustration of both sides of a U.S. Penny.

Both sides of a Penny

An illustration of both sides of a U.S. Penny.

An illustration of both sides of a U.S. Penny that can be cutout and folded.

Two Sided Penny

An illustration of both sides of a U.S. Penny that can be cutout and folded.

This bottle was intended to hold poison. Poisons are substances that can cause disturbances to organisms, usually by chemical reaction.

Four Sided Poison Bottle

This bottle was intended to hold poison. Poisons are substances that can cause disturbances to organisms,…

Illustration of a concave polygon. A concave polygon is a polygon of which tow or more sides, if produced, will enter the polygon.

Concave Polygon

Illustration of a concave polygon. A concave polygon is a polygon of which tow or more sides, if produced,…

Illustration of a convex polygon. A polygon is convex when no side when produced will enter the polygon.

Convex Polygon

Illustration of a convex polygon. A polygon is convex when no side when produced will enter the polygon.

Illustration that shows similar polygons (pentagons) that can be used to show proportionality.

Similar Polygons (Pentagons) That Can Be Used To Show Proportionality

Illustration that shows similar polygons (pentagons) that can be used to show proportionality.

Illustration that shows similar polygons (pentagons) that can be used to show proportionality.

Similar Polygons (Pentagons) That Can Be Used To Show Proportionality

Illustration that shows similar polygons (pentagons) that can be used to show proportionality.

Illustration to show that an angle bisector of a triangle divides the opposite side into segments which are proportional to the adjacent sides.

Angle Bisector of Triangle Dividing Opposite Side Into Proportionate Segments

Illustration to show that an angle bisector of a triangle divides the opposite side into segments which…

Illustration to show that a bisector of a an exterior angle of a triangle divides the opposite side into segments which are proportional to the adjacent sides.

Exterior Angle Bisector of Triangle Dividing Opposite Side Into Proportionate Segments

Illustration to show that a bisector of a an exterior angle of a triangle divides the opposite side…

Illustration to show that if a line divides two sides of a triangle proportionally, it is parallel to the third side.

Triangle Divided by Parallel Lines to Form Proportionate Triangles

Illustration to show that if a line divides two sides of a triangle proportionally, it is parallel to…

"A pyramid is a solid whose base is a polygon, and whose sides are triangles uniting at a common point, called the vertex." —Hallock 1905

Pryamid

"A pyramid is a solid whose base is a polygon, and whose sides are triangles uniting at a common point,…

Illustration of a quadrilateral which has two adjacent sides equal and the other two sides equal. It is symmetrical with respect to the diagonal joining the vertices of the angles formed by the equal sides, and the diagonals are perpendicular to each other.

Quadrilateral with Symmetry

Illustration of a quadrilateral which has two adjacent sides equal and the other two sides equal. It…

An illustration of both sides of a U.S. Quarter.

Both sides of a Quarter

An illustration of both sides of a U.S. Quarter.

An illustration of both sides of a U.S. Quarter that can be cutout and folded.

Two Sided Quarter

An illustration of both sides of a U.S. Quarter that can be cutout and folded.

Adult skull, side view.

Adult skull

Adult skull, side view.

"Method of using a grounded metallic comb near the driving belt to relieve the belt of static charges." —Croft 1920

Using a Grounded Metallic Comb to Reduce Static Charge, Front and Side View

"Method of using a grounded metallic comb near the driving belt to relieve the belt of static charges."…

Historically, the name referred to a large shelf of rock which jutted out from the Canadian shore, located just north of the present observation and commercial complex. Revealed in the mid-1700s as the Horseshoe Falls receded, Table rock was the first major vantage point for tourists of the early and mid-1800s. In 1818 the first part of the rock collapsed, followed by minor rock falls in 1828 and 1829. The most notable rock fall occurred in July, 1850, wen roughly one-third of the point collapsed into the Niagara Gorge.

Table Rock

Historically, the name referred to a large shelf of rock which jutted out from the Canadian shore, located…

A table is an item of furniture comprising an open, flat surface supported by a base or legs. It may be used to hold articles such as food or papers at a convenient or comfortable height when sitting, and is therefore often used in conjunction with chairs. Unlike many earlier table designs, most modern tables do not have drawers, although they are not uncommon.

Intrigue Design Table

A table is an item of furniture comprising an open, flat surface supported by a base or legs. It may…

Triangle with sides a, b, c and angles A, B, C labeled.

Triangle

Triangle with sides a, b, c and angles A, B, C labeled.

Triangle with sides labeled with numerals 28, 36, 40 and angles A, B, C labeled.

Triangle 28, 36, 40

Triangle with sides labeled with numerals 28, 36, 40 and angles A, B, C labeled.

Triangle with labels A, B, C, D

Triangle

Triangle with labels A, B, C, D

Illustration showing a triangle with angles A, B, and C labeled.

Triangle ABC

Illustration showing a triangle with angles A, B, and C labeled.

Illustration showing an acute triangle (one that has all three angles that are acute).

Acute Triangle

Illustration showing an acute triangle (one that has all three angles that are acute).

Illustration of a triangle showing that when a line parallel to the base of a triangle bisects one side, it bisects the other side also.

Triangle With Bisector Parallel to the Base

Illustration of a triangle showing that when a line parallel to the base of a triangle bisects one side,…

Triangle construction when given two angles and the included side.

Triangle Construction When Given 2 Angles and Included Side

Triangle construction when given two angles and the included side.

Illustration showing an equiangular triangle (one that has all three angles that are equal).

Equiangular Triangle

Illustration showing an equiangular triangle (one that has all three angles that are equal).

Illustration showing an equilateral triangle (one that has three sides equal).

Equilateral Triangle

Illustration showing an equilateral triangle (one that has three sides equal).

Illustration showing a triangle with exterior angles. This can be used to show the sum of the three angles of a triangle is equal to two right angles.

Triangle with Exterior Angles Drawn

Illustration showing a triangle with exterior angles. This can be used to show the sum of the three…

Illustration showing an isosceles triangle (one that has two sides equal).

Isosceles Triangle

Illustration showing an isosceles triangle (one that has two sides equal).

Illustration showing an isosceles triangle with a segment inside. This can be used to show that in an isosceles triangle the angles opposite the equal sides are equal.

Isosceles Triangle With Interior Segment Drawn

Illustration showing an isosceles triangle with a segment inside. This can be used to show that in an…

Illustration to show that if one of the legs of an isosceles triangle is produced through the vertex by its own length, the line joining he end of the leg produced to the nearer end of the base is perpendicular to the base.

Leg Produced through the Vertex of an Isosceles Triangle

Illustration to show that if one of the legs of an isosceles triangle is produced through the vertex…

Illustration to show that if the lines joining the middle points of the sides of a triangle divide the triangle into four equal triangles.

Midpoints of Triangle Divide Triangle into Four Equal Triangles

Illustration to show that if the lines joining the middle points of the sides of a triangle divide the…

Illustration showing an obtuse triangle (one that has one obtuse angle).

Obtuse Triangle

Illustration showing an obtuse triangle (one that has one obtuse angle).

Illustration used to show the various parts of a triangle: sides, angles, medians, altitudes, bisectors, and segments.

Parts Of A Triangle

Illustration used to show the various parts of a triangle: sides, angles, medians, altitudes, bisectors,…

Illustration to show the perpendiculars dropped from any point in the equilateral triangle to the three sides is constant, and equal to the altitude.

Perpendiculars Dropped Any Point in the Equilateral Triangle

Illustration to show the perpendiculars dropped from any point in the equilateral triangle to the three…

Right triangle with sides a, b, c and angles A, B, C labeled.

Right Triangle ABC

Right triangle with sides a, b, c and angles A, B, C labeled.

Illustration showing a right triangle (one that has one right angle).

Right Triangle

Illustration showing a right triangle (one that has one right angle).

Right triangle with sides 15 and 18.

Right Triangle With Sides 15 and 18

Right triangle with sides 15 and 18.

Illustration of a right triangle with legs labeled 150 and 85. This could be used to find the hypotenuse using Pythagorean Theorem.

Right Triangle With Sides 85 and 150

Illustration of a right triangle with legs labeled 150 and 85. This could be used to find the hypotenuse…