15] 2x + 7x = 90°
9x = 90°
x = 90° : 9
x = 10°
sudut AOB
= 90° + 7x
= 90° + 7 . 10°
= 90° + 70°
= 160°
16] 4p + 108° = 180°
4p = 180° - 108°
p = 72° : 4
p = 18°
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15] 2x + 7x = 90°
9x = 90°
x = 90° : 9
x = 10°
sudut AOB
= 90° + 7x
= 90° + 7 . 10°
= 90° + 70°
= 160°
16] 4p + 108° = 180°
4p = 180° - 108°
p = 72° : 4
p = 18°