Explanation:

Sweet dreams

Sleep well

Nighty night

Rest peacefully

Sleep tight

Pleasant dreams

Sweet slumbers

Dreamland awaits

Slumber peacefully

Rest well

Have a peaceful sleep

Verified answer

[tex]Sum \: of interior \: angles \: of \: \\ a \: triangle = 180°[/tex]

[tex]∠ A+ ∠B + ∠C = 180° \\ \\ 50° + 30° + ∠ C= 180° \\ \\ 80 ° + ∠C = 180° \\ \\ ∠ = 180° - 80° \\ \\ ∠C = 100°[/tex]