Mensurationmedium · Past Paper
The total surface area of a cone is 704 cm² and its radius is 7 cm. Find its slant height.
A18 cm
B20 cm
C25 cm
D30 cm
✓ Correct Answer: C — 25 cm
πr(r+l) = 704 => (22/7) * 7 * (7+l) = 704 => 22(7+l) = 704 => 7+l = 32 => l = 25 cm.
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