Question

Plssss helppppp, this is geometry

Answer 1

Answer:

90

Step-by-step explanation:

the question sat sum of A'angle and B'angle.

so A+B=180  

so when you subtract 180-90=90

Answer 2

Answer:

Step-by-step explanation:

measure angle b

add it with 90

90 + b = A

and create an angle with the measure of sum (A)