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DRDO Multi tasking staff Model paper 4
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© examsnet.com
Question : 89
Total: 100
What is the perimeter of the sector whose central angle is 60° and radius of the circle is 21 cm?
128 cm
96 cm
64 cm
32 cm
Validate
Solution:
θ = 60° and r = 21 cm
Length of arc = (θ°/360°) × 2πr
Length of arc = (60/360) × 2 × (22/7) × 21
Length of arc = 22 cm
Since, Perimeter of the sector = length of arc + 2r
Therefore, Perimeter of the sector = 22 + (2 × 21) = 64 cm
© examsnet.com
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