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2. Luas = ½ alas tinggi
120 = ½ x alas x 8
alas = 30 cm
2x+3x+7x=180
12x=180 >> x=180/12=15derajat.
<K= 2x = 2(15)=30derajat
<L=3x = 3(15) = 45 derajat
<M= 7x = 7(15) = 105 derajat. jadi, sudut terkecil adalah <K.
2. L.segitiga= 1/2(alas)(tinggi)
120 = 1/2(alas)(8)
120 = 4alas
alas = 120/4 = 30 cm.