SOLUTION: Radius=? Diameter=28cm Slanting height=30cm Total surface area of a cone=?

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Question 1005136: Radius=?
Diameter=28cm
Slanting height=30cm
Total surface area of a cone=?
Answer by MathLover1(20850) About Me  (Show Source):
You can put this solution on YOUR website!

the formula for the lateral surface area of a pyramid is A=pi%2Ar%2As
if given
Diameterd=28cm=> radius r=d%2F2=28cm%2F2=14cm
Slanting height s=30cm
we have
A=pi%2A14cm%2A30cm
A=420%2Api%2Acm%5E2......pi=3.14
A=420%2A3.14cm%5E2
A=1318.8cm%5E2