Which equation can you use to solve for x?
o x+56 = 180
o x + 56 = 146
x + 146 = 180
o 180 - 1 = 146
56°
146°

I think the second option is correct.

because the unknown angle is 90.

and if replace anyone of the x with 90 the equation isn't correct except with the second option.

Step-by-step explanation:

if you want me to show you how I got 90 degree for x just tell me and I'll show you

Hope this helps

d. vertex

step-by-step explanation: