A right angle = 90 degrees ( complementary )
a straight angle = 180 degrees ( supplementary )
Hence, GNH + HNT = 90 ( YES )
JNK + KNL = 180 ( NO )
KNL + LNM = 90 ( YES )
< HNK + < KNL = 180 ( YES )
< MNG + < GNH = 90 ( NO )
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