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प्रश्न
What is the length of arc of a circle of radius 7 cm which subtends an angle of 90° at the centre of the circle?
विकल्प
22 cm
11 cm
`77/2` cm
`11/2` cm
उत्तर
11 cm
Explanation:
Given that,
Radius of circle = 7 cm
Central angle = 90°
Length of arc = `2πr (90^circ/360^circ)`
= `π r/2`
= `22/7 xx 7/2`
= 11 cm
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