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Question
secondary 3 | A Maths
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Find the area of the sector then round to the nearest tenth
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But the area of a full circle is calculated for 360°
And so if you want to calculate the area for only a portion of it , i.e. only for 77°, then the formula would be:
77
----- × π × r^2
360
77
= ----- × π × 10.7^2
360
By substituting the value of π here, the area of sector is:
= 76.93 inches
Rounding off to the nearest ten is the answer:
~ 80 inches