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n0. 17 jawab A
cara = 2x + 38 =155
2x = 117
x = 58,5
13) yg mungkin 120° (c)
14) < A + < B + < C = 180°
4x + 5x + 3x = 180°
12x = 180°
x = 15
< BAC = 4.15 = 60° (b)
15) 3x + 2x = 90°
5x = 90°
x = 18
< SPR = 2.18 = 36° (d)
16) 270° --> sudut refleks (c)
17) 2x + 38 + 25 = 180°
2x + 63 = 180
2x = 180 - 63
2x = 117
x = 58,5 (a)
18) < FOE = 90 - 35 = 55°
< BOE = < FOE = 55° (d)
19) < BCA = 180 - (45 + 60) = 75°
< ACD = 180 - 75 = 105° (C)
semoga sedikit membantu ya :)