A circle whose area is 4 has a radius of x find the area of a circle whose radius is 3x

The first one is 1.12867 because you need to set it up like this.

4=3.14 (x) squared

4/3.14=x (squared)

x=1.12867

The second one is done simply by multiplying it out.

A=3.14 (3x) squared

A=3.14 (9x[squared])

A=28.26x[squared] - The squared is referring to the x.