Find diameter of base of a cone if its slant height is 7cm and curved surface area is 44 sqcm.
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area of cone = 1/3πr² = 44cm²
1/3×22/7×r² = 44cm²
22/21×r² = 44
r² = 44/22×21
= 42
r² = 42
r = √42
diameter = 2(√42)
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