Answer:
[tex]1) \: x +( x + 18) = \\ 180 \: (linear \: pair) \\ \\ 2x = 180 - 18 \\ x = \frac{162}{2} = [/tex]
81°
[tex]2) \: 90 + x + x + \frac{x}{2} \\ \\ = 360 \: (complete \: angle) \\ \\ \frac{180 + 5x}{2} = 360 \\ \\ 180 + 5x = 720 \\ 5x = 720 - 180 \\ x = \frac{540}{5} = [/tex]
108°
Try the third one on your own
(hint ) =
[tex]2x + x = 180[/tex]
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Answers & Comments
Answer:
[tex]1) \: x +( x + 18) = \\ 180 \: (linear \: pair) \\ \\ 2x = 180 - 18 \\ x = \frac{162}{2} = [/tex]
81°
[tex]2) \: 90 + x + x + \frac{x}{2} \\ \\ = 360 \: (complete \: angle) \\ \\ \frac{180 + 5x}{2} = 360 \\ \\ 180 + 5x = 720 \\ 5x = 720 - 180 \\ x = \frac{540}{5} = [/tex]
108°
Try the third one on your own
(hint ) =
[tex]2x + x = 180[/tex]