Q2 of 23 Page 1

Solve any four sub-questions:

Find the area of the sector of a circle of radius 8 cm and arc with length 15 cm.

Radius of circle = OA = r = 8 cm

Length of arc = l = 15 cm






∴ 15 × 360 = ∠AOB × 16 × π


∴ 15 × 90 = ∠AOB × 4 × π


∴ 1350 = ∠AOB × 4 × π


∴ 337.5 = ∠AOB × π


∴ ∠AOB = 337.5/ π







∴ area of sector = 60 cm2


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