Question

how do find the measure of angle a if they give you two x+54 and 80°

Answer 1

I'm assuming you mean a triangle?

Well you know that a triangles interior angles add up to 180...

you have 2 sides

x + 54
and
80
and the third side would be
x

so we have

(x + 54) + 80 + x = 180

Can you solve for x ?