A circle with part of a triangle inscribed in it. They are lying on a coordinate plane.

Diagram used to prove the theorem: "Every section of a sphere by a lane is a circle."

If the chords of a circle are drawn through a fixed point, then the points of intersection of the pairs…

Illustration of a cyclic quadrilateral, a quadrilateral inscribed in a circle. This can also be described…

Illustration showing that the radian is an angle that when placed at the center of a circle its sides…

Illustration used to draw lines which are radii of a circle where the center is inaccessible.

"In ordinary work the usual way of rectifying an arc is to step around it with the dividers, in spaces…

"In a circle, sound is reflected from every plane surface placed around it, and hence, if the sound…

Illustration of a regular heptagon/septagon circumscribed about a circle. This can also be described…

Illustration of ring (small circle in larger concentric circle) with piece cut out.

Illustration of ring (small circle in larger concentric circle) sprung into place.

"Use the entire blossom mingled with buds and green leaves, all short stemmed, not longer than three…

Circular rosette with 12 petals in a circle. It is made by rotating circles about a fixed point. The…

Circular rosette with 12 petals. It is made by rotating circles about a fixed point. The radii of the…

Circular rosette with 16 petals in a circle. It is made by rotating circles about a fixed point. The…

Circular rosette with 16 petals in a circle. It is made by rotating circles about a fixed point. The…

Circular rosette with 24 petals in a circle. It is made by rotating circles about a fixed point. The…

Circular rosette with 24 petals. It is made by rotating circles about a fixed point. The radii of the…

Circular rosette with 3 petals. It is made by rotating circles about a fixed point. The radii of the…

Circular rosette with 32 petals in a circle. It is made by rotating circles about a fixed point. The…

Circular rosette with 32 petals in a circle. It is made by rotating circles about a fixed point. The…

Circular rosette with 6 petals in a circle. It is made by rotating circles about a fixed point. The…

Circular rosette with 48 petals in a circle. It is made by rotating circles about a fixed point. The…

Circular rosette with 6 petals in a circle. It is made by rotating circles about a fixed point. The…

Circular rosette with 6 petals. It is made by rotating circles about a fixed point. The radii of the…

Circular rosette with 8 petals in a circle. It is made by rotating circles about a fixed point. The…

Circular rosette with 8 petals in a circle. It is made by rotating circles about a fixed point. The…

"The power is generally applied by a wheel or a lever, and moves through the circumfrence of a circle.…

"A screw cut on a solid, of such form that if any plane be taken through its longitudinal axis, the…

A secant is "a line which cuts a figure in any way. Specifically, in trigonometry, a line from the center…

An illustration showing a circle sector with radius r, center/central angle v, and length of circle…

An illustration showing a circle sector with center/central angle v and polygon angle w.

Illustration of a circle used to prove "Any angle inscribed in a semicircle is a right angle."

"Until hard rock is reached the sides of the excavation are supported temporarily by a lining"—Finley,…