Find the area of 3/4 of a circle with a radius of 4.2 in.
| January 11, 2021 | education
the area of the whole circle is calculated by the formula: nd2, the number n multiplied by the diameter squared
the diameter is equal to two radii, the investigator diameter is 2 * 4.2 = 8.4 dm
then the area of the circle will be equal to 3.1 * 8.4 * 8.4 = 218.736 dm2
now let’s calculate how much 3/4 of the total area of the circle will be. To do this, convert 3/4 to a decimal fraction. this is 0.75. multiply the resulting area of the circle by this value: 0.75 * 218.736 = 164.052 dm2
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