1.find the arc length of a semicircle whose diameter is 14cm
2.find the radius of the sector when the angle at the center is 180 degrees and the perimeter is 180cm
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Step-by-step explanation:
length of the arc in semicircle=x°/360°×πr
angle in a semicircle=90°
=90°/360°×22/7×7
=5.5cm
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