Pakai cara biar jelas​

Jawab:

25. A

26. B

27. C

28. D

29. C

30. Tidak ada

Penjelasan dengan langkah-langkah:

25. 2x + 95° + 3x = 180°

5x = 180° – 95°

5x = 85°

x = 85° : 5

x = 17°

26. A + B = 90°

3a + 3b = 270°

7b + 3b = 270°

10b = 270°

b = 270° : 10

b = 27°

27. f dan c

b dan g

28. 7x + 5x + 3x = 180°

15x = 180°

x = 180° : 15

x = 12°

<AOB = 7x = 7(12°) = 84°

29. <ADB = 180° – 130° = 50°

<ABD = 180° – 50° – 90° = 40°

<ABC = 180° – 40° = 140°

30. 180° – 60° = x + y

120° = x + y