Qus : 2
MCA NIMCET PYQ
2
The smaller area bounded by
$y = 2 - x$
and
$x^2 + y^2 = 4$
is:
1
$\pi - 1$ 2
$\pi - 2$ 3
$2\pi - 1$ 4
$2\pi - 2$ Go to Discussion
MCA NIMCET Previous Year PYQ
MCA NIMCET NIMCET 2009 PYQ
Solution Line intersects circle at two symmetric points.
Required smaller area = circular segment area.
Solve intersection:
$y = 2 - x$
$x^2 + (2 - x)^2 = 4$
$x^2 + x^2 - 4x + 4 = 4$
$2x^2 - 4x = 0$
$2x(x - 2) = 0$
So intersection points at $(0, 2)$ and $(2, 0)$.
Using known segment area formula → the smaller area = $\pi - 2$.
Qus : 8
MCA NIMCET PYQ
1
Area between $y = 2 - x^2$ and $y = x^2$
1
$\dfrac{8}{3}$ 2
$\dfrac{4}{3}$ 3
$\dfrac{2}{3}$ 4
$\dfrac{5}{3}$ Go to Discussion
MCA NIMCET Previous Year PYQ
MCA NIMCET NIMCET 2010 PYQ
Solution Solve intersection:
$2 - x^2 = x^2$
$2x^2 = 2$
$x^2 = 1$ → $x = -1,\ 1$
Area = $\int_{-1}^{1} [(2 - x^2) - x^2] dx$
$= \int_{-1}^{1} (2 - 2x^2) dx$
$= 2\int_{-1}^{1} (1 - x^2) dx$
Compute:
$\int_{-1}^{1} 1 dx = 2$
$\int_{-1}^{1} x^2 dx = \frac{2}{3}$
Area = $2(2 - \frac{2}{3}) = \frac{8}{3}$
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