bantu jawab ya gan... makasih

31. (4x + 18)° + 2x = 90°
6x° + 18 = 90°
6x° = 90° - 18°
6x° = 72°
x = 12°
=> jawaban yg benar (C)✔

32. <ABD + <CBD = 180°
14x° + 4x° = 180°
18x° = 180°
x = 10°
=> <ABD = 14x = 14(10) = 140°
=>jawaban yang benar (D)✔

33. 5b° + b° + 2b° + 40° = 180°
8b° + 40° = 180°
8b° = 180° - 40°
8b° = 140°
b = 17,5°
=> jawaban yang benar (A)✔

34. E dan C
=> jawaban yang benar (B)✔

35. D dan B
=> jawaban yang benar (D)✔

36. A dan E
=> jawaban yang benar (B)✔

37. <A = <B => 38° = 38°
=> jadi besar sudut C adalah 38°
=> jawaban yang benar (A)


39. 2x + 15° + 135° = 180°
2x + 150° = 180°
2x = 180° - 150°
2x = 30°
x = 15°