Formula for area of a circle: A=πr^2
Formula for circumference of a circle: C=πd
3. You are given the diameter of the circle; the diameter is twice the radius. Divide the diameter by 2:
15/2=7.5
Now, use the formula for the area of a circle:
A=π7.5^2
A=176.7146
C. 177 cm2
4. Use the formula for the circumference of a circle:
C=π25
C=78.5298
B. 79 inches
Hope this helps!!