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Mathematics
Problem
Which area should be calculated to know how much paint is needed to cover only the curved surface of a cylindrical water tank of radius 2 m and height 3 m? a)
A
=
2
π
r
(
h
+
r
)
A = 2\pi r(h + r)
A
=
2
π
r
(
h
+
r
)
b)
A
=
π
r
2
A = \pi r^{2}
A
=
π
r
2
c)
A
=
2
π
r
h
A = 2\pi r h
A
=
2
π
r
h
d)
A
=
π
r
h
A = \pi r h
A
=
π
r
h
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