Geometry Practice Test 5

Question : 5 of 40

Marks: +1, -0

In a circle of radius 21 cm, an arc subtends an angle of 72° at the centre. The length of the arc is:

Solution:

OA = r = 21 cm
∠AOB = 72°
Length of the arc =

{72}/{360} × 2 × {22}/7 × 21

1/5

× 2 × 22 × 3 = 26.4 cm

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