The circumference is 18 cm. What is the area of a circle enclosed within this circle?
| June 1, 2021 | education
The area of a circle is calculated by the formula:
S = πR².
And the circumference is expressed as:
L = 2πR. Where R is the radius. According to the condition of the assignment, this value is 18 cm, and π = 3, we express the radius:
2 * 3.14 * R = 18. To find the unknown factor, divide the product by others:
R = 18: 2: 3 = 9: 3 = 3 cm.
Substitute the result into the first formula and get:
S = 3 * 3² = 27 cm².
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