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besar sudut KNM= 32°+32° = 64°
besar sudut LKN= 41°+90°+ Y = 180°
131°+ y =180°
y =180°-131°
Y = 49
b.diagonal×diagonaal:2=(3,5+3,5)×(5,6+4):2
=7×9,6:2=33,6