Question

The area of circle Z is 64 ft2.

What is the value of r?

r = 4 ft
r = 8 ft
r = 16 ft
r = 32 ft

Answer 1

$\bf Area = 64\qquad r=\sqrt{\cfrac{Area}{\pi }}\implies r=\sqrt{\cfrac{64}{\pi }}\implies r \approx 4.5$

can 4.5 be rounded up to 4? nope.

Answer 2

For this case we have as data that the area of the circle is given by:

$Area = 64 \ ft ^ 2$

According to the following formula, we must find the radius of the circle:

$r = \sqrt {\frac {Area} {\pi}}$

Taking $\pi = 3.14$ we have:

$r = \sqrt {\frac {64} {3.14}}\\r = \sqrt {20.38}\\r = 4.5$

Finally, the radius of the circle is 4.5ft

Answer:

4.5ft