Estimate the area of a circle with a radius of 21 meters. Use 22/7 for pi.
The formula for the area of a circle is A = πr^2, where π (pi) is a mathematical constant approximately equal to 3.14, and r is the radius of the circle.
Using 22/7 for pi and a radius of 21 meters, we can estimate the area of the circle as:
A = (22/7) x 21^2
A = (22/7) x 441
A = 1386 square meters (rounded to the nearest whole number)
Therefore, the estimated area of the circle with a radius of 21 meters is 1386 square meters.