Q. 44.5( 2 Votes )

Find the area of the region {(x,y): x2 + y2 4, x + y 2}  
[CBSE 2012]

Answer :

The equation of the given curves are

X2 + y2 = 4 (i)

X + y = 2 (ii)

Clearly X2 + y2 = 4 represents a circle X + y = 2 is the equation of a straight line cutting x and y axes at (0, 2) and (2, 0) respectively.

These are shown in the graph below:

The required area is given by

We have y1 = 2 – x and y2 =

the area of the region {(x,y): x2 + y2 4, x + y 2}is

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