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प्रश्न
The area of the region bounded by the circle x2 + y2 = 1 is ______.
विकल्प
2π sq.units
π sq.units
3π sq.units
4π sq.units
उत्तर
The area of the region bounded by the circle x2 + y2 = 1 is π sq.units.
Explanation:
Given equation of circle is x2 + y2 = 1
⇒ y = `sqrt(1 - x^2)`
Since the circle is symmetrical about the axes.
∴ Required area = `4 xx int_0^1 sqrt(1 - x^2) "d"x`
= `4[x/2 sqrt(1 - x^2) + 1/2 sin^-1 x]_0^1`
= `4[0 + 1/2 sin^-1 (1) - 0 - 0]`
= `4 xx 1/2 xx pi/2`
= π sq.units
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