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no 8. sudut C3 = 24 x 8/2 = 96 derajat
no 9. 70 + 5x = 180 ---> x = 120/5 = 24 derajat ...... Maka sudut A = 24 x 2 = 48 derajat
no 11. sudut bac = (180 - 60)/2 = 60 derajat
no 12. 80 + 5x = 9x + 20 ---> 60 = 4x ---> x = 15 derajat ..... Maka, 9x + 20 = 135 + 20 = 155 derajat
semoga membantu dan jadikan jawaban terbaiik ya:))