// ∠C = 90
∠A + ∠B = 90
∠A = 90 - ∠B
(180 - ∠A) - (180 - ∠B) = 20
180 - (90 - ∠B) - 180 + ∠B = 20
-90 + ∠B + ∠B = 20
-90 + 2∠B = 20
2∠B = 20 + 90
2∠B = 110
∠B = 55
∠A = 90 - 55 = 35
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// ∠C = 90
∠A + ∠B = 90
∠A = 90 - ∠B
(180 - ∠A) - (180 - ∠B) = 20
180 - (90 - ∠B) - 180 + ∠B = 20
-90 + ∠B + ∠B = 20
-90 + 2∠B = 20
2∠B = 20 + 90
2∠B = 110
∠B = 55
∠A = 90 - 55 = 35