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Find the area of the region bounded by the curves x2 = 8y, y = 2, y = 4 and the Y-axis, lying in the first quadrant - Mathematics and Statistics

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प्रश्न

Find the area of the region bounded by the curves x2 = 8y, y = 2, y = 4 and the Y-axis, lying in the first quadrant

योग

उत्तर

Given equation of the parabola is x2 = 8y

∴ x = `+-  2 sqrt(2y)`

∴ x = `2sqrt(2y)`     .....[∵ In first quadrant, x > 0]

∴ Required area = `int_2^4 x  "d"y`

= `int_2^4 2sqrt(2y)  "d"y`

= `2sqrt(2)[(y^(3/2))/(3/2)]_2^4`

= `(4sqrt(2))/3 [(4)^(3/2) - (2)^(3/2)]`

= `(4sqrt(2))/3 (8 - 2sqrt(2))`

= `(8sqrt(2))/3 (4 - sqrt(2))` sq.units

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Area Bounded by the Curve, Axis and Line
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अध्याय 2.5: Application of Definite Integration - Short Answers I

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