Answer:
24
Step-by-step explanation:
Let n = number of sides
15n = 360
divide both sides of the equation by 15
n = 24
A is a base angle because... well... it's connected to the base.
B is a leg
C is the vertex angle
D is a leg
E is a base angle for the same reason as A.
F is the base
-9.1 < d - 6.3
add 6.3 to both sides
-2.8 < d or d > -2.8