A rope of length 18m is used to form a sector of a circle of...

WAEC 1988

A rope of length 18m is used to form a sector of a circle of radius 3.5m on a school playing field. What is the size of the angle of the sector, correct to the nearest degree?

A. 33^o
B. 40^o
C. 90^o
D. 180^o
E. 270^o

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Correct Answer: Option D

Explanation

Circumference = 2πr
2 x 22/7 x 3.5 ≅ 22m
22m = 360o
11m = 360/22 x 11 = 180o

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A rope of length 18m is used to form a sector of a circle of...

Correct Answer: Option D

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