Will mark brainiest! what is the value of x?

enter your answer in the box.

45°

Step-by-step explanation:

All triangles are 180°.

So, we must first add up all of the other numbers:

80° + 55° = 135°

Next, we must find how much more we need to get to 180°:

180° - 135° = 45°

So, x = 45°

And, if you want to make sure. Just add up the numbers and make sure the sum is 180.

80 + 55 + 45 = 180

I hope this helps you out ; )

p

step-by-step explanation: