The curved surface area of a cone is 670 cm2 and its radius is 15cm Find its slant height and total surface area
13770.4 cm2
1377.04 cm2
137.704 cm2
137704 cm2
A
1377.04 cm2
B
137.704 cm2
C
137704 cm2
D
13770.4 cm2
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Solution
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The correct option is B 1377.04 cm2 Curved surface area of the cone = πrl=670cm2 or 227×15×1=670orl=670×722×15=14.21cm ∴ Total surface area = πr(r+l)227×15(15+14.21)=1377.04cm2
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