Illustration of a regular hexagon inscribed in a circle. This can also be described as a circle circumscribed…

Illustration of a square, with diagonals drawn, circumscribed about a circle. This can also be described…

Illustration of a square, with 1 diagonals drawn, circumscribed about a circle. This can also be described…

Illustration of a square circumscribed about a circle. This can also be described as a circle inscribed…

Illustration of a square, with diagonals drawn, inscribed in a circle. This can also be described as…

Illustration showing a circle with an inscribed and circumscribed quadrilateral.

Illustration of a parallelogram with diagonals drawn to show they bisect each other.

Illustration to show that when lines from two opposite vertices of a parallelogram to the midpoints…

Quadrilateral with intersecting diagonals and segment connecting midpoints.

Illustration to show that if the diagonals of a quadrilateral bisect each other, the figure is a parallelogram.

Illustration to show that if the diagonals of a parallelogram are equal, the figure is a rectangle.

Illustration showing a square with diagonals, lines, and parallel lines

Illustration of 2 concentric squares whose vertices are connected by line segments.

Illustration of a square inscribed in a square that is inscribed in another square. Each successive…

Illustration of a square inscribed in a square that is inscribed in another square. Each successive…

Illustrations of an isosceles trapezoid with equal diagonals drawn.

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