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The area bounded by the curve y=x2y = x^2 between x=0x = 0 and x=πx = \pi in the first quadrant is :

Solution

✅ Correct Option: 2

We need the area under y=x2y = x^2, above the xx-axis, from x=0x = 0 to x=πx = \pi.

Whenever we need the area under a curve, we use definite integration — think of it as summing up infinitely thin vertical strips between the curve and the xx-axis.


Setting up the integral:

Area=∫0πx2 dx\text{Area} = \int_0^{\pi} x^2 \, dx

Since both xx and y=x2y = x^2 are non-negative between 00 and π\pi, we are entirely in the first quadrant.


Applying the power rule ∫xn dx=xn+1n+1+C\int x^n \, dx = \dfrac{x^{n+1}}{n+1} + C :

∫0πx2 dx=[x33]0π\int_0^{\pi} x^2 \, dx = \left[\dfrac{x^3}{3}\right]_0^{\pi}


Substituting the upper and lower limits:

=(π)33−(0)33= \dfrac{(\pi)^3}{3} - \dfrac{(0)^3}{3}

=π33−0= \dfrac{\pi^3}{3} - 0

=π33= \boxed{\dfrac{\pi^3}{3}}


Don't confuse this with area under y=sin⁡xy = \sin x or y=cos⁡xy = \cos x which also commonly use 00 to π\pi as limits. Here the curve is y=x2y = x^2, a basic polynomial, so we simply apply the power rule — no trigonometry involved.

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