Question

Find the area of a circle with a diameter of four

Answer 1

12.57

Explanation:

the formula for the area of a circle is
`\pi r^(2)`

the diameter is 2 times the radius, so dividing it by 2 gives you a radius of 2

substitute the 2 for the r in the formula and solve

`\pi 2^(2)`

4
`\pi`

≈12.57

Answer 2

A = 12.56637

Explanation:

`A = \pi * r^2\\\pi = 3.14159`

`r = diameter / 2\\4 / 2 = 2`

A = 3.14159 * (2^2)

= 12.56637