Estimate the area of a circle with radius of 21 meters. Use 22/7 for π
66 square meters
1,386 square meters
4,356 square meters
132 square meters
1,386
I took the test
To estimate the area of a circle, you can use the formula A = πr², where A is the area and r is the radius of the circle.
In this case, the radius is given as 21 meters and π is given as 22/7.
To find the area, we substitute the values into the formula:
A = (22/7) * (21)²
To simplify, we first square the radius:
A = (22/7) * (441)
Next, we multiply the numerator and denominator by 63 to eliminate the fraction:
A = (22 * 63) / 7
Multiplying the numerator gives us 1386, so the area of the circle is:
A = 1386 square meters.
Therefore, the correct answer is 1,386 square meters.
To estimate the area of a circle with a radius of 21 meters, you can use the formula for the area of a circle:
Area = π * radius^2
Given a radius of 21 meters, and using the approximation of 22/7 for the value of π, we can calculate the area as follows:
Area = (22/7) * (21^2)
= (22/7) * (441)
= 1386 square meters
So, the estimated area of the circle is 1,386 square meters. Thus, the correct answer is 1,386 square meters (option 2).