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162 = 1/2 x 9 x (x - 5)
324 = 9x - 45
9x = 369
x = 9
23.
sudut ACB = 180 - 110 = 70 derajat
sudut ABC = 180 - 130 = 50 derajat
sudut BAC = 180 - 70 - 50 = 60 derajat
24. kurang jelas mana A, mana B, mana C
tapi jelasnya ketiga sudut di dalam segitiga itu sbb:
[180 - (4x + 20)] + 50 + [180 - 6x] = 180
x= 21
masukkan x ke masing2 persamaan