Answer:
This is an unfinished question, will you please finish this question in the comments of this answer, so I may edit my answer later ?
Step-by-step explanation:
A= substitution property
b=definition of linear angles
c= subtraction property
Answer:
11
Step-by-step explanation:

<h2>
<em>OladipoSeun</em><em>♡˖꒰ᵕ༚ᵕ⑅꒱</em></h2>
It is a right, isosceles triangle.