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<S = <R = 64 derajat
<P kiri = 180 - (64 + 64)
4y = 180 - 128
4y = 52
y = 52/4
y = 13cm
ΔPQR adalahsegitiga sama kaki, sehingga
<Pkanan = <Q = 4x
<Rkanan dan <Rkiri adalah berpelurus = 180 derajat
<Rka + <Rki = 180
<Rka + 64 = 180
<Rka = 180 - 64 = 116 derajat
ΔPQR = 116 + 4x + 4x
180 = 116 + 8x
180 - 116 = 8x
64 = 8x
x = 64/8
x = 8 derajat
x + y
= 8 + 13
= 21 derajat ==> A