Question

The diameter of a circle is 26 cm. Find its area to the nearest whole number.

Answer 1

Answer:

531

Step-by-step explanation:

The area of a circle can be determined by the equation: A = πr².

The "r-value" represents the radius, which is half of the diameter. Since the diameter is in cm, the area will have the unit cm².

d = diameter       r = radius       π = 3.14.....       A = area

d / 2 = r

26 / 2 = r

13 cm = r

A = πr²

A = π(13)²

A = 169π

A = 530.929.... cm²

A = 531 cm²

As you can see, the radius was determined to be 13 cm. When you plug that value into the area equation, you get 530.9 cm². Rounding to the nearest whole number would bump the 0 to 1, making the final answer 531 cm².

Answer 2

Area= pi x r^2
= pi x 13^2
=pi x 169
= 530.929
= to the nearest whole number 531