• (90 - ∠B) = 1 1/2 ∠B
    (90 - ∠B) = 3/2 ∠B
    2(90 - ∠B) = 3∠B
    180 - 2∠B = 3∠B
    180 = 3∠B + 2∠B
    180 = 5∠B
    ∠B = 180/5
    ∠B = 36°