Answer:
It depends
Step-by-step explanation:
Area of a circle is given by
A = pi *r^2
We can find the radius by taking 1/2 of the diameter
r= 1/2(21)
r = 10.5
A = pi * (10.5)^2
A = 110.25 pi
Approximating pi with 3.14
A = 110.25 * 3.14
A =346.185 in^2
To the nearest tenth
A = 346.2 in^2
If we use the pi button on the calculator
A = 346.3605901
Rounding to the nearest tenth
A = 346.4 in^2
You need to determine whether you approximate pi by 3.14 or use the pi button on your calculator
