If 15cm is the diameter then the radius is 7.5cm If the circumference is 15cm then the radius is 7.5/pi cm
When you try to figure out an area of a circle, you square the radius, then multiply it by pi to get the area of a circle. A radius square is radius x radius, or radius squared.
A circle with a radius of 4 cm has an area of 50.27 square cm.
The area of a circle with a radius of 7 cm is: 153.9 cm2
The area of any circle is (pi) x (radius)2 .The area of half the circle is just half of that number.
706.5 cm
What’s the answer
If 15cm is the diameter then the radius is 7.5cm If the circumference is 15cm then the radius is 7.5/pi cm
The radius is 1.27cm
Diameter = Radius*2 = 30 cm.
The surface area of a cylinder where height is 80cm and radius is 15cm equals 8953.54cm2
7.5cm (r = d/2)
double the radius to get the diameter = 30 multiply by pi (3.1415...) = 92.245 cm
ANUS
Area = (pi) (radius)2 = 225 pi = 706.858 square centimeters (rounded)
Using 3.14 as Pi the area of circle is: 379.94
176.715 cm2 (rounded)