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Mathematics
Problem
Which of the following expressions represents the curved (lateral) surface area of a right circular cone with base radius
r
r
r
and slant height
ℓ
\ell
ℓ
? a)
1
2
π
r
ℓ
\dfrac{1}{2}\pi r\ell
2
1
π
r
ℓ
b)
2
π
r
ℓ
2\pi r\ell
2
π
r
ℓ
c)
π
r
ℓ
\pi r\ell
π
r
ℓ
d)
π
r
(
r
+
ℓ
)
\pi r\,(r+\ell)
π
r
(
r
+
ℓ
)
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