Ex 11.1, 14
Tick the correct answer in the following :
Area of a sector of angle p (in degrees) of a circle with radius R is
(A) /180 2 R (B) /180 R2 (C) /360 2 R (D) /720 2 R2
Area of a sector = /360 2
Where = angle , r = radius of circle
Here, we have
= p and radius = R
Putting these values in formula
Area of sector = /360 2
= /360 2
But , these is no such option which is matching with answers
So, multiply 2 in numerator and denominator
Area of sector = /360 R2 2/2
= /720 2 R2
Hence, option (D) is correct

Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 13 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.

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