perimeter = sum of all sides
27 = 9+7.8+x
x (third side) = 10.2
Answer:
:0 no one knows
Step-by-step explanation:



which means either

or

. The equation has no solution, since

is always bounded between -1 and 1. The second has one solution at

, and any number of complete revolutions will also satisfy this equation, so in general the solution would be

where

is any integer.
So you could choose

and

.
Answer: either I don't understand the question or its 72% and I'm fairly certain its 72%