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
33o
B
40o
C
90o
D
180o
E
270o
Verified Correct Answer: D.
Step-by-Step Mathematical Solution
Circumference = 2\pir
2 x 22/7 x 3.5 ≅ 22m
22m = 360o
11m = 360/22 x 11 = 180o
Source: Myschool Past Questions Archive (Record #22199)