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प्रश्न
If radius of the base of cone is 7 cm and height is 24 cm, then find its slant height.
विकल्प
23 cm
26 cm
31 cm
25 cm
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उत्तर
25 cm
Explanation:
l = `sqrt(r^2 + h^2)`
= `sqrt((7)^2 + (24)^2`
= `sqrt(49 + 576)`
= `sqrt(625)`
l = 25
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Find the total surface area of frustum, if its radii are 15 cm and 7 cm. Also, the slant height of the frustum is 14 cm.
Radii of the frustum = `square` cm and `square` cm
Slant height of the frustum = `square` cm
Total surface area = `π[(r_1^2 + r_2^2 + (r_1 + r_2)l]`
= `22/7 [square + square + (square + square) square]`
= `22/7 (square)`
= `square` cm2
Hence, the total surface area of the frustum is `square`.
