Question

find the surface area of the cone In terms of pi.

Answer 1

i got u give me a minute to work it out

Answer 2

the surface area of the cone is 1130.40 cm^2

Answer 3

The equation for the surface area of a cone is
(pi)(r)(s)+ (pi)(r)^2

So your legitimate equation will be:
(3.14)(12)(18)+(3.14)(12)^2

Answer 4

=678.24+452.16= 1130.40

Any questions? :}

Answer 5

eh I think I understand

Answer 6

ok so u kno what pi equals right

Answer 7

3.14 my book wants the answer in terms of pi

Answer 8

The total surface area is (as posted above by jojo)
\[ \pi r s+ \pi r^2 \]
in terms of pi means don't simplify by multiplying by pi
in other words, just figure out the part in parens
\[ (rs + r^2)\pi \]
and write pi next to it. That will be the *exact* answer. Once you multiply by an approximation for pi (such as 3.14) you get an answer... but it is not exact.
(that is because pi is goes on forever, and we can't write down all of its decimals. If we use only a few of the digits, we don't get an exact answer.)

Answer 9

Exactly thank you @phi 3.14 is just a universal approximation of the actual value of pi

Answer 10

I think that I got the wrong answer