I assume that by square corners you mean 90 degree angles. if this is the case then there are 2 in a pentagon. Hope I helped :)
5(3)-(-3)
15- (-3)
15+3 = 18
There is 180 degrees in a triangle. We know two of the angles are 50 degrees. 180-50= 130 which is X.
Answer:
Which one?
Step-by-step explanation: