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महाराष्ट्र राज्य शिक्षण मंडळएचएससी वाणिज्य (इंग्रजी माध्यम) इयत्ता १२ वी

Find the Area of the Region Bounded by the Parabola Y2 = 16x and the Line X = 4.

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प्रश्न

Find the area of the region bounded by the parabola y2 = 16x and the line x = 4. 

बेरीज
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उत्तर

The region bounded by the parabola `y^2` = 16x and
the line x = 4 is the area OACO
The area OACO is symmetrical about x-axis
Area of OACO = 2(Area of OAB) 

Area of OACO = `2int_0^4y dx`

                     =`2int_0^4 4sqrtx   dx` 

                   =`8[x^(3/2 )/(3/2)]_0^4` 

                    =`16/3[x^(3/2)]_0^4`

                     =`16/3(8)=128/3` 

Therefore, the required area is `128/3`sq. units. 

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2017-2018 (March)

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