Question

Find the area of a circle with a diameter of four

Answer 1

Answer:

12.57

Step-by-step 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

Answer:

A = 12.56637

Step-by-step explanation:

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

$r = diameter / 2\\4 / 2 = 2$

A = 3.14159 * (2^2)

= 12.56637