Object Within the Focus in a Concave Mirror
"...let us suppose the object a, to be placed before the mirror, and nearer to it than the principal…
Visual Angle
"Suppose the object a, appears to the naked eye of the length repreesnted in the drawing. Now, as the…
Using Proportions To Find Heights of Trees
Triangle diagram for measuring heights of trees using proportions.
Using Proportions To Find Heights of Trees
Triangle diagram for measuring heights of trees using proportions
Area of Triangle
Parallelogram illustration to show where the area of a triangle formula comes from.
Pentagon With Triangular Sections For Area
Pentagon with dimensions labeled. Pentagon can be used to calculate area by calculating individual triangles…
Triangle 28, 36, 40
Triangle with sides labeled with numerals 28, 36, 40 and angles A, B, C labeled.
Pythagorean Theorem Triangle
Right triangle with squares that can be used to illustrate the Pythagorean Theorem.
Similar Triangles for Distance Across Stream
Illustration of similar triangles used to find distance across a stream
Similar Triangles for Distance Across Lake
Illustration of similar triangles used to find distance across a lake.
Similar Triangles for Height of Smokestack
Illustration of similar triangles used to find height of smokestack.
Circles Enclosed in Equilateral Triangle
Illustration of three circles enclosed in an equilateral triangle.
Circles With Radius 4000 and Enclosed Triangle
Illustration of circle with radius of 4000, and triangle with 45 degree angle enclosed.
Triangle Inscribed in Circle
Illustration of triangle inscribed in circle. Or, circle circumscribed about triangle.
Triangle Construction When Given 2 Angles and Included Side
Triangle construction when given two angles and the included side.
Hexagon Inscribed in Circle by Construction
Illustration of regular hexagon and triangle inscribed in circle.
Prismatoid With Triangular Faces
An illustration of a prismatoid with triangular faces and points labeled.
Pyramid Frustum With Triangular Bases and Height of 27 inches
An illustration of a pyramid with the top cut off by a plane parallel to the base. The remaining part…
Pyramid Frustum With Triangular Bases and Height of 27 inches
An illustration of a pyramid with the top cut off by a plane parallel to the base. The remaining part…
Right Triangle Formed by Flagpole (x feet high) and Ground With Rope (x+4 feet)
An illustration of a right triangle made up of a flagpole, rope, and the ground. Illustration could…
Right Triangle With Sides x, 75, and 40
An illustration of a right triangle with sides, 40, 75, and x. Additional height of x is added to 75.…
Reference Angles/Triangles Formed by Angles in Quadrants
Lines drawn to horizontal to form triangle ratios (reference triangles, angles).
Reference Angles/Triangles Formed by Angles in Quadrants With Labels
Lines drawn to horizontal to form triangle ratios (reference triangles, angles). Axes, quadrants, abscissa,…
Right Triangle with leg 13 and hypotenuse 15
Right triangle ABC with angles A, B, C labeled and leg of 13 with hypotenuse of 15.
Right Triangle With Sides .64 and 1 and Angle of 40 degrees
Right triangle OQP with angle of 40 degrees, height of .64 inches, and hypotenuse of 1 inch.
Right Triangle With Sides .7 and 1 and Angle of 35 degrees
Right triangle OQP with angle of 35 degrees, height of .70 inches, and leg of 1 inch.
Special Right Triangle with Angles 45, 45, 90 degrees
Special right triangle with angles 45 degrees, 45 degrees, and 90 degrees with side measures/relationships…