If the radius of the circle is R, then the area of the whole circle is πR2
So the area of the semicircle is 0.5*Ï€R2
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To find the radius of a circle with a given area of 628, you can use the formula for the area of a circle, A = πr^2, where A is the area and r is the radius. Rearranging the formula to solve for the radius, you get r = √(A/π). Substituting the given area of 628 into the formula, you get r = √(628/π) ≈ √(199.87) ≈ 14.14. Therefore, the radius of the circle is approximately 14.14 units.
Divide the circumference by pi, and that will give you the diameter. Then take half of the diameter (the radius), and plug it into the formula for the area of a circle (A=πr²)
The area of a circle is pi x r2 So you just have to find the radius of your circle, which is the radius of your golf ball. Then substitute it into the area of a circle formula as above.
Formula for area of a circle is A = pr2r = 1/2d = 12.5cm, p = 3.142A = 3.142 x (12.5cm)2A = 490.9375cm2
Pi r squared comes from the formula to find the area of a circle.