The function A(r)=πr^2 may be used to find the area of a circle with radius r. Find the area of a circle whose radius is 11 centimeters.
A = 3.14 * 11 * 11
To find the area of a circle with a given radius using the function A(r) = πr^2, you need to substitute the value of the radius (r) into the equation.
In this case, the radius is given as 11 centimeters. So, we can replace r with 11 in the equation A(r) = πr^2.
A(11) = π(11)^2
Now, we need to perform the calculations:
A(11) = π(121)
The value of π (pi) is approximately 3.14, so we can substitute it into the equation:
A(11) ≈ 3.14(121)
And now, we can simplify the expression:
A(11) ≈ 380.14
Therefore, the area of a circle with a radius of 11 centimeters is approximately 380.14 square centimeters.