## Book: RD Sharma - Mathematics (Volume 2)

### Chapter: 21. Areas of Bounded Regions

#### Subject: Maths - Class 12th

##### Q. No. 21 of Exercise 21.1

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21
##### Draw a rough sketch of the curve and find the area between x - axis, the curve and the ordinates x = 0, x = π.

Given equations are:

…..(i)

x - axis …..(ii)

x = 0 ……(iii)

x = …..(iv)

A table for values of is: -

A rough sketch of the curves is given below: -

We have to find the area of shaded region.

Required area

(the area can be found by taking a small slice in each region of width Δx, then the area of that sliced part will be yΔx as it is a rectangle and then integrating it to get the area of the whole region)

(As x is between (0,) and the value of y varies)

(as )

Apply reduction formula:

On integrating we get,

On applying the limits we get

Hence the area between x - axis, the curve and the ordinates x = 0, x = π is equal to square units.

21

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