Step-by-step explanation:

its 1/4 of the circle
circle circumference:

we need 1/4 of it, so its

X-12=20
x=20+12
x=32
answer is 32
So y = 18x + 12 , xeR so Y equals to (12)
It's 7/8 ...which is the simplest form of 35/40...
Hope it helps !!!
Answer:

Step-by-step explanation:
The lateral surface area of a cone is given by
, where
is the radius of the base of the cone and
is the cone's slant height.
Solving for
:

*Note: It is implied that the surface area of 200 pi square inches is lateral surface area and not total surface area, because it is impossible to obtain a total surface area of 200 pi with a radius of 10 inches.