(4) Find the perimeter of a sector of a circle if its measure is 90° and radius is 7 cm.
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Step-by-step explanation:
perimeter of sector = 2πr(∅/360) +2r
= (2×22/7×7)90/360 +2×7
= 44×1/4 + 14
= 11 +14
= 25cm
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