How do you find the area of a circle in terms of pi if the diameter is 2.1m?

Question

13027 views around the world

You can reuse this answer
Creative Commons License

Answer 1 · 2015-09-08T15:46:53

The area of the circle is #1.1025 pi# square meters.

The formula for the area of a circle is:

#Area = pir^2#

You can't use this formula directly, because you're given the diameter, not the radius.

The radius of a circle is half of the diameter, so we divide the diameter by #2#.

#2.1 -: 2 = 1.05#

Since the radius is #1.05# meters, the area is

#pi * (1.05)^2# square meters.

#1.05 xx 1.05 = 1.1025# square meters.

The area of the circle is #1.1025 pi# square meters.