RD Sharma - Mathematics (Volume 2)

Book: RD Sharma - Mathematics (Volume 2)

Chapter: 21. Areas of Bounded Regions

Subject: Maths - Class 12th

Q. No. 1 of Exercise 21.3

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1

Calculate the area of the region bounded by the parabolas y2 = 6x and x2 =6y.

The given equations are,


y2 = 6x



And x2 = 6y.



When y = 0 then x = 0,


Or


Putting x value on y2 = 6x,


y2 = 6


Or 6


Or


Or y = 6


When y = 0 then x = 0,


And When y = 6 then x = 6,


On solving these two equations, we get point of intersections.


The points are O (0,0) and A(6,6). These are shown in the graph below



Now the bounded area is the required area to be calculated, Hence,


Bounded Area, A = [Area between the curve (i) and x axis from 0 to 6] - [Area between the curve (ii) and x axis from 0 to 6]




On integrating the above definite integration,



Area of the region bounded by the parabolas y2 = 6x and x2 = 6y is 12sq. units.


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