RS Aggarwal - Mathematics

Book: RS Aggarwal - Mathematics

Chapter: 18. Area of Circle, Sector and Segment

Subject: Maths - Class 10th

Q. No. 19 of Exercise 18B

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In a circle of radius 10.5 cm, the minor arc is one-fifth of the major arc. Find the area of the sector corresponding to the major arc.

Given radius of circle = R = 10.5 cm

Let the area of major sector be ‘A1’ and that of minor sector be ‘A2

We know, Area of circle = Area of major sector + Area of minor sector

Area of circle = A1 + A2

We also know, Area of circle = πR2

Where R = radius of circle, put value of area of circle in equation 2.

(taking 5 as L.C.M on R.H.S)

= 288.75 cm2

The area of major sector is 288.75 cm2.

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