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besar sudut K=M , N=L Jumlah sudut-sudut yang berdekatan adalah 180° , K + N= 180°, + D = 180°. jadi sudut K = a+5 N = 3a-25 , jadi besar K+N = 180 ⇒ a+5+3a-25=180 ⇒ =4a-20=180 ⇒ 4a= 180-20 ⇒ a = 160 ÷ 4 ⇒ a = 40 cm