#1**+2 **

Alternating angles are = x = 21 degrees

or the sum of the angles in a triangle = 180

the other angle near A = 90 - 21 = 69^{o}

then 69 + x + 90 = 180^{o}

x + 159 = 180

x = 21 degrees

ElectricPavlov Apr 17, 2021