if possible,find the missing side length labeled with a question mark. if not possible, explain why. on the left at here are 6 inches 6 inches twice . inside the triangle there are 36 inches 36 inches twice. and the in the bottom there is 20 inches

Answer:
10 inches
Step-by-step explanation:
They're 36 degrees, so corresponding angles are the same, so the middle line is parallel to the bottom line of the triangle.
But the middle line bisects one of the waist lines of the triangle, so this is the middle line, which is equal to half the length of the bottom line