Answer:
A, B,C but not d
Step-by-step explanation:
A because its just 90 degrees, same with b, and c. but not d because its under 90
If I remember correctly, right angles are 90 degree angles. So the answers would be A. B. and C.
If you see the little box on the angle, that means it's a 90 degree (right) angle.
5.4
The equations are equal so set them equal to each other and solve