Question

The height of a cylinder is 3 units. Its radius is 10 units. What is the volume of the cylinder, in cubic units?

(Use π = 3.14)

a.314 cubic units
b.942 cubic units
c.3,140 cubic units
d.9,420 cubic units

Answer 1

What is the formula for the volume of a cylinder?

Answer 2

Remember that the formula of a cylinder volume is
\[V=\pi \color{red}{r ^{2}}\color{green}h\]
where r is radius and green is height, by replacing with \[\color{red}r=10, \color{green}h=3\]
So
\[V=3.14\cdot\color{red}{10^{2}}\cdot \color{green}3\]

Answer 3

do i multiply them together?

Answer 4

Yes, multiplication is often represented by little dots \[\cdot\] or by "x"s \[\times\] but they mean the same thing. :)

Answer 5

but when i multiplied 3.14 by 100 and by three it equaled to 942 and thats not one of the answers