Illustration of a pentagonal polyhedron that is formed by having two parallel congruent pentagonal bases…

Illustration of a pentagonal polyhedron that is formed by having two parallel congruent pentagonal bases…

Illustration of a pentagonal polyhedron that is formed by having two parallel congruent pentagonal bases…

Illustration of a trapezium, a quadrilateral having no two sides parallel. The diagonal is labeled in…

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

Illustration used to prove the theorem "The line bisecting one of the non parallel sides of a trapezoid…

Illustrations of an isosceles trapezoid with equal diagonals drawn.

Illustrations of a trapezoid with a line joining the midpoints of the diagonals.

Illustrations of a trapezoid with a line segment drawn parallel to one side

Illustrations to show trapezoids with lines joining the midpoints of the sides of any quadrilateral,…