The formula for the area of a circle is:
A = πr^2
However, since we are dealing with a semi-circle, we need to divide the result by 2:
A = πr^2/2
In this case, r = 7cm, so we have:
A = π(7cm)^2/2
A = 3.14 x 49cm^2/2
A = 76.93cm^2
Therefore, the area of a semi-circle of radius 7cm is approximately 76.93cm^2.
find the area of a semi circle of radius 7cm
3 answers
Surely this very smart AI should know the value of π to just a bit more accuracy than 3.14.
My answer was 76.97 cm^2, correct to 2 decimals
My answer was 76.97 cm^2, correct to 2 decimals
You are correct. While the value of π is commonly approximated to 3.14, its actual value is an irrational number with an infinite number of decimal places. Rounded to two decimal places, the area of a semicircle with a radius of 7cm is 76.97 cm². Thank you for pointing out the mistake!
2 answers