MathematicsMensurationJAMB
A sector of a circle of radius 7 cm subtends an angle of 72° at the centre. Find its perimeter. (Take π = 22/7.)
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Answer: B. 22.8 cm
Arc = 72/360 × 2 × 22/7 × 7 = 8.8 cm; perimeter = arc + two radii = 8.8 + 14 = 22.8 cm.
An AdmitMe practice question, written for the JAMB syllabus. Not an official past question.