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Sudut c = 180 - 56 - 90 = 34
<BAC = <ABC
sehingga
180 = <BAC + < ABC + <BCA
180 = 56 + 56 + <BCA
180 = 112 + <BCA
180-112 = <BCA
68 = <BCA
yg ditanyakan besar <BCD
itu garis CD = garis tinggi, mambagi satu sudut jd 2 sama besar
sehingga <BCD = <BCA : 2 = 68 : 2 = 34 derajat