Recall that


Adding these together, you have


Replace

with

and

with

. You end up with


and so

and

.
Answer:
540°
Step-by-step explanation:
If a triangle (3 sides) has 180 degrees then we can figure out the degrees in a pentagon.
180° + 360° = 540°
How? The "top" part could be seen as a triangle (180 degrees), and we know that a quadrilateral's angles add up to 360 degrees, so when we add them together we get out answer!
Answer:
b
Step-by-step explanation: