3. Let r represent the radius of a circlelet d represent the diameter. The circumference of a circle is given by the formula C = πd. The area of a circle i

Question

3. Let r represent the radius of a circle and let d represent the diameter. The circumference of a circle is given by the formula C = πd. The area of a circle is given by the formula A = πr2. Find the areas and circumferences of circles with radii 4, 5, 6, and 8 using π = 3.14. Round to the nearest hundredth.

Answer 1

r = 4

A = πr²                  C = 2πr                 

A = (3.14)(4²)       C = 2(3.14)4

A = 50.24 units²    C = 25.12 units

 

r = 5

A = (3.14)(5)²        C = 2(3.14)5      

A = 78.50 units²       C = 31.4 units

 

I assume that you can do the rest.