a part of circle
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For a circle with a diameter of 20 mm, it's radius, which is half that, will be 10 mm. The area (A) of a circle is pi (about 3.1416) times the radius (r) squared (r2). Here's how we work it: Acircle = pi x r2 = 3.1416 x 102 = 3.1416 x 100 = 314.16 mm2
Part of a circle's circumference is an arc
Part of the circumference of a circle is called an arc.
A fraction.
A cone has two faces. The large triangular part and the circular part at the bottom.