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45 + x = 180
x = 135 = xyr
untuk mencari sudut ZQR di cari sudut ZQY dulu
ZQY = 180 - 45 - 90
ZQY = 45
ZQR = 180 - 45 - 45 (beepelurus)
ZQR = 90 , XYQ = 135
Maka tidak terbukti bahwa ZQR = XYQ
yang benar ZQR < XYQ