A ≈ 28.27cm2
The circumference of a circle with a diameter of 6cm is about 18.85cm
Area of a circle = (pi) R2 = (pi) x (1/2 of the diameter)2 = 9 pi = 28.27 cm2 (rounded)
The exact area = pi*32 or 9*pi square cm
12 cm.
The radius of the circle is half the diameter of the circle. 30mm radius would mean 60mm diameter or 6cm.
12 cm
The diameter of circle A is 12cm so its radius must be 6cm.
6/2 = a radius of 3 cm
The circumference of a circle = 2*pi*radius or diameter*pi
Since the diameter is always twice the length of the radius, the length of the radius is 6cm.
12 cm A diameter is twice as long as the radius of a circle. D = 2r D = 2(6cm) = 12cm