How do i find the measure of angle a?

A = 20

Step-by-step explanation:

A + 71x - 1 = 90o That's because all triangles have 180 degrees.

71x - 1 + 20x = 90        Combine like terms.

91x - 1 = 90                  Add 1 to both sides.

91x - 1 + 1 = 90 + 1        Combine

91x = 91                       Divide by 91

91x/91 = 91/91

x = 1

Angle A = 20x

Angle A = 20*1

Angle A = 20

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i hope this answer you! if you have any further questions or concerns, feel free to ask! : )

step-by-step explanation:

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