Find the radius of a circle given that the circumference is 66cm.
C = pi * 2r
66 = 3.14 * 2r
66 = 6.28r
10.51 = r
circumference = pi x d
66cm ÷ pi = 19.098593171 (rounded to the nearest 10th decimal)
the diameter is twice as long as the radius.
19.098593171 ÷ 2 = 9.54929658551
a more simple way to put it is
9.55 (rounded to the hundreth)
To find the radius of a circle given the circumference, you can use the formula:
C = 2πr
where C is the circumference and r is the radius.
In this case, you are given that the circumference is 66 cm. Substituting this value into the formula, we have:
66 = 2πr
To solve for r, we need to isolate it. First, divide both sides of the equation by 2π:
66 / (2π) = r
Now, let's approximate the value of π as 3.14 and evaluate the calculation:
66 / (2 * 3.14) = r
66 / 6.28 ≈ r
r ≈ 10.51 cm
Therefore, the radius of the circle is approximately 10.51 cm.