area of a base of a cone is 1386sq.cm and it's height is 28 cm Find the slant height
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Answer:
slant height = 35 cm
Step-by-step explanation:
area of the base of the cone = πr² = 1386
22/7 * r² = 1386
r² = 1386 * 7 / 22
r² = 63 * 7
r = 3*7 = 21 cm
slant height ² = radius² + height²
l² = 21² + 28 ²
l² = 441 + 784
l² = 1225
l = 35 cm
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