The base angles theorem- if two sides of a triangle are congruent, then the angles opposite of them are congruent. Hope this helps :)
Answer:
The answer is 10
Step-by-step explanation:




a=10
The length of the unknown side is 17.5
Answer: 7
Step-by-step explanation:
Use the slope formula which is y2-y1/x2-x1. -1-4/5-(-2)= -5/7