1.

Find the length of arc whose radius is 7 cm and central angle 90°.

Answer»

Here θ = 90°; radius r = 7cm

Length of the arc = θ°/360° × 2πr units

= 90°/360° × 2 × 22/7 × 7 = 11 cm

∴ Length of the arc = 11 cm



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