"The degree to which the air has been exhausted from a closed vessel in which there is a partial vacuum…

Circle modeling the earth. O is the center of the earth, r the radius of the earth, and h the height…

An illustration of a right circular cone with la radius of 1 foot and a height of 2 feet. Illustration…

Right circular cylinder with a radius of 1 foot and a height/altitude of 2 feet.

Illustration used to show how to draw an equilateral triangle when given the altitude.

An illustration of a girl measuring the heights of a boy and girl.

Illustration modeling the illumination on a surface when the surface is not perpendicular to hte rays…

Leveling is an operation in which the object is to determine to difference of vertical height between…

Illustration of parallelogram AEFC drawn two different ways with base b and altitude/height a used to…

Parallelogram with dimensions labeled. Parallelogram can be used to calculate area.

Parallelogram with dimensions labeled. Parallelogram can be used to calculate area.

Parallelogram with dimensions drawn to show relationship to the area of a rectangle.

Pentagon with dimensions labeled. Pentagon can be used to calculate area by calculating individual triangles…

Illustration of 2 similar right decagonal prisms. Both have regular decagons for bases and rectangular…

Illustration of 2 similar right heptagonal/septagonal prisms. Both have regular heptagons/septagons…

Illustration of 2 similar right hexagonal prisms. The height of the prism and length of the side of…

Illustration of 2 similar right hexagonal prisms. The height of the prism and length of the side of…

Illustration of 2 right pentagonal pyramids with hidden edges shown. The pentagonal bases are congruent,…

Illustration of 2 right rectangular pyramids with hidden edges shown. The rectangular bases are congruent,…

Illustration of 2 similar right pentagonal pyramids with hidden edges shown. The height of the pyramid…

Rectangle with dimensions labeled. Rectangle can be used to calculate area.

An illustration of a right triangle inscribed in a semicircle.

Illustration of a trapezoid with altitude a and bases b and b' used to demonstrate that the area is…

Trapezoid with dimensions labeled. Trapezoid can be used to calculate area.

Triangle diagram for measuring heights of trees using proportions.

Triangle diagram for measuring heights of trees using proportions

Triangle ABC with sides a,b,c labeled and angles A,B,C labeled and h labeled as height.

An illustration of a triangle comprised of a church and two lines. This illustration can be used to…

An illustration of a three triangles created with boats and a lighthouse. This is an example illustration…

An illustration of a triangle comprised of a tower and two lines. This illustration can be used to determine…

An illustration of a triangle comprised of a tree and two lines. This is an example of a problem that…

Parallelogram illustration to show where the area of a triangle formula comes from.

Illustration of triangle ABC with altitude a and base b to be used to demonstrate that the area is 1/2ba.

Triangle ABC with sides a,b,c labeled and angles A,B,C labeled and h labeled as height.

Illustration of similar triangles used to find height of smokestack.

Illustration that shows two similar triangles with altitudes drawn.

"When any liquid is placed in one or more of several vessels communicating with each other, it will…