Question 2
Find the total surface area of a cone, if its slant height is 21 m and diameter of its base is 24 m. [Assumeπ=227]
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Solution
Radius (r) of the base of the cone =(242)m=12m
Slant height (l) of the cone = 21 m
Total surface area of the cone = πr(l+r)=[227×12×(12+21)]m2=(227×12×33)m2=1244.57m2