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6.
3x - 5 + 2x + 5 = 90
5x = 90
x = 18

Penyiku ∠POR = ∠ROQ
= 2x + 5 = 2 . 18 + 5
= 41°

7.
3x - 6 + 4x + 25 = 180
7x - 19 = 180
7x = 161
x = 23

Pelurus ∠AOC = ∠COB
= 4x + 25 = 4 . 23 + 25
= 117°

8.
2x - 2 + 4x + 2 = 180
6x = 180
x = 30

∠DBC = 4x + 2 = 4 . 30 + 2 = 122°