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junior college 2 | H1 Maths

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Slant height , cone radius and height can be taken as sides of a right angled triangle.

Apply Pythagoras' Theorem,

r² + h² = 5²

r² = 25 - h²

area of cone

= ⅓πr²h

= ⅓π(25 - h²)h

= ⅓π(25h - h³)

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