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3a + 2a = 90
5a = 90
a = 90 : 5
a = 18
Gambar II :
46 + a + 29 + 5a + 15 = 180
6a + 90 = 180
6a = 180 - 90
6a = 90
a = 90: 6
a = 15
4. A. sudut A + sudut B = 180 derajat
2/3 sudut B + 1 sudut B = 180 derajat
1 2/3 sudut B = 180 derajat
5/3 sudut B =180 derajat
sudut B = 180/5 = 180 × 3/5 =108 derajat
sudut A = 180 derajat - 108 derajat = 72 derajat
B. sudut A + sudut B = 90 derajat
2/3 sudut B = 1 sudut B =90 derajat
5/3 sudut B = 90×3/5 =54 derajat
90 - 54 = 36 derajat
selisihnya : 54 derajat - 36 derajat = 18 derajat