Angle a and angle b are vertical angles with measue of angle a=x and measure of angle b=5x-80

we know that

Vertical Angles are the angles opposite each other when two lines cross. They are always congruent to one another

in this problem

∠A and ∠B are vertical angles

so

∠A=∠B

we have

∠A=

∠B=

equate angle A and angle B

solve for x

therefore

the answer is

the measure of angle A is

Step-by-step explanation:

Hope it helps:)

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25% is the answer