Question

A circle has a diameter of 26 units.What is the area of the circle to the nearest hundreths of the square units?

Answer 1

The answer is 2122.64 square units. The diameter is 2 times the radius, so the radius is 13. The formula for he area of a circle is 4 pi times the radius squared. 13 squared is 169, times 4 is 676. Using 3.14 for pi, multiply that by 676 and you get 2122.64 square units.

Answer 2

A = 530.66 units^2

Explanation:

Area of a circle is given by

A = pi * r^2

The radius is 1/2 of the diameter

r = d/2

r =26/2

r =13

Now we can find the area

A = pi * (13)^2

A = 169 pi

We can approximate pi by 3.14

A = 169(3.14)

A =530.66