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sudut A + sudut B = 90 derajat
4x - 13 + 3x + 5 = 90
4x + 3x - 13 + 5 = 90
7x - 8 = 90
7x = 90+ 8
7x = 98
x = 14
besar sudut B
3x + 5
3. 14 + 5 = 47 derajat
2x+30+5x+10=180
2x+5x+30+10=180
7x=180-40
x= 140/7 =20