# Arc of a circle

For arcs the following formulas hold:

Area = pi*Radius^2*(alpha/360°)

Arc length = 2*pi*Radius*(alpha/360°)

The formulas for the arec are: If the angle is alpha, the area is A=pi*r^2*(alpha/360°) and the arc length is b=2*pi*r*(alpha/360).

Fur further information, move the mouse over the words below, and the corresponding piece will be marked below.

radius

arc length

angle alpha

area