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What is the measure of angle A, in degrees?

What Is The Measure Of Angle A In Degrees class=

Sagot :

Answer:  55 degrees

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Explanation:

Let B represent the unmarked angle on the left between angle A and the 145 degree angle.

Angle B and the 145 degree angle form a straight line of 180 degrees

B+145 = 180

B = 180-145

B = 35

Then use the fact that angles A and B form a 90 degree angle

A+B = 90

A+35 = 90

A = 90-35

A = 55

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