mathematics
posted by
unknown on
.
A cylindrical gasoline can is 18 inches across and 20 inches tall. which expression represents the approximate volume in cubic inches ?
1) (3.14)(9)2(20)
2) (3.14)(9)(20)2
3) (3.14)(18)(20)
4) (3.14)(18)2(20)
5) (3.14)(36)2(20)

mathematics 
Ms. Sue,
V = pi * r^2 * h
Which of your answers expresses that formula?

mathematics 
unknown,
number 4

mathematics 
Ms. Sue,
No. The radius is not 18.

mathematics 
Anonymous,
the answer is
5

mathematics 
Ms. Sue,
Nope. The radius is half the diameter.