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1.

Find the area bounded by the curve `y=(4-x^2)` the y-axis and the lines y=0 y=3

Answer» Required area `=underset(-2)overset(3)intx dy = underset(0)overset(3)int sqrt(4-y ) dy `
2.

Find the area of the region in the first quadrant enclosed by the x-axis, the line `y = x`, and the circle `x^2+y^2=32`.

Answer» Required area `=underset(4)overset(0)int xdx+underset(4)overset(4sqrt(2))int sqrt(32-x^2)dx`
`=[x^2/2]_0^4+[(xsqrt(32-x^2))/2+32/2sin^-1""x/(4sqrt(2))]_4^(4sqrt(2))`
`4 pi` sq units
3.

Find the area of the region bounded by the curve `y^2=4x`and the line `x = 3`.

Answer» Since the equation `y^2=4x` contains only even powers of y the curve is symmetrical about the y - axis
`therefore ` required area = `2.underset(0)overset(3)int2sqrt(x)`dx
4.

Using integration, find the area of the region bounded by the parabola `y^2=16x` and the line `x=4`

Answer» `y^2=16x` is a right-handed parabola with its vertix at the origin
And x=4 is the line parallel to the y-axis at a distance of 4 units from it .