2014
Mathematics
JAMB
If the angle of a sector of a circle with radius 10.5 cm is 120°, find the perimeter of the sector. [Take π=22/7]
A.
48 cm
B.
40 cm
C.
43 cm
D.
45 cm
Correct Answer: 43 cm
Explanation
Perimeter of the sector = 2r+θ/360° × 2πr = 2(10.5) + 120/360 × 2 ×(22/7) × 10.5 = 21 + 22 = 43 cm
Perimeter of the sector = 2r+θ/360° × 2πr = 2(10.5) + 120/360 × 2 ×(22/7) × 10.5 = 21 + 22 = 43 cmTHIS WEEK's
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