A circle with a radius of 16 cm has an area of 804.25 square cm.
If a circle has a circumference of 16 cm then the radius is about: 2.546 cm
Area of a circle = π*r2 =π*16 =16*pi cm2
The probability as a fraction that a point chosen at random within a circle of radius 10 cm will be inside a concentric circle of radius 4 cm is the ratio of the area of the smaller circle (4 cm radius) to the area of the larger circle (10 cm radius). Therefore, the probability is (4^2)/(10^2) = 16/100 = 4/25.
Area of a circle in square cm = pi*radius squared
4 cm radius = Area of 50.26548 sq. cm.
A circle with a radius of 3 cm has an area of 28.27 square cm.
A circle with a radius of 2 cm has an area of 12.57 square cm.
A circle with a radius of 25 cm has an area of 1,963.5 square cm.
A circle with a radius of 19 cm has an area of 1,134.11 square cm.
A circle with a radius of 4 cm has an area of 50.27 square cm.
A circle with a radius of 2.7 cm has an area of 22.9 square cm.