Question

A circle has an area of 40 square meters. Which answer is closest to the measure of its diameter?

A.1.8 meters
B.4 meters
C.3.6 meters
D.7.1

Answer 1

D. 7.1
A circle has an area of 40 square meters. Which answer is closest to the measure of its diameter?

Answer 2

Answer:

Option D. $7.1\ m$

Step-by-step explanation:

we know that

The area of a circle is equal to

$A=\pi r^{2}$

In this problem we have

$A=40\ m^{2}$

substitute and solve for r

$40=\pi r^{2}$

$r^{2}=40/( \pi)$

$r=3.57\ m$

Multiply the radius by $2$ to obtain the diameter

so

$3.57*2=7.14\ m$