Answer:
C 377
Step-by-step explanation:
I simply typed in "surface area of cone calculator" in chrome and did it that way, since there is quite a complex formula for finding it out on your own.
(This is the formula : pi * r^2 + pi * r * sqrt (r^2+h^2)
Fraction which are red = 50/250
= 1/5
To get the percent we multiply by 100:-
1/ 5 * 100
= 100/5
= 20% answer
