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प्रथम चतुर्थेाश में सम्मिलित एव ` y = 4x^(2), x = 0` y =1 तथा y = 4 से घिरे क्षेत्र का क्षेत्रफल ज्ञात कीजिए।

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वक्र `y = 4x^(2)` तथा रेखाओ `y = 4, x = 0, y = 1` के द्वारा प्रथम चतुर्थेाश में घिरा क्षेत्रफल छायांकित क्षेत्र द्वारा दर्शाया गया है।
`therefore` अभीष्ट क्षेत्रफल ( छायांकित क्षेत्र में दर्शाया हुआ)
`= int_(1)^(4) xdy`
` = int_(1)^(4) (1)/(2)sqrt(y) dy = (1)/(2) [(y^(3//2))/(3//2)]_(1)^(4)`
`= (1)/(3) (4^(3//2) - 1^(3//2))`
` = (1)/(3)(8-1) = (7)/(3)`वर्ग इकाई ।
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