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OAB is a sector of a circle with radius 9cm and center O. The angle at O is 30°.

1 Answer

6 votes

Answer:

Area of sector = 21.195 cm²

length of arc = 4.71 cm

Explanation:

Given:

Radius of circle (r) = 9 Cm

Angle at O = 30°

Find:

Area of sector.

length of arc.

Computation:

⇒ Area of sector = [θ/360]πr²

Area of sector = [30/360]3.14(9)²

Area of sector = 21.195 cm²

⇒ length of arc = [θ/360]2πr

length of arc = [30/360]2(3.14)(9)

length of arc = 4.71 cm

User LaYer Sutachad
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