Find the angle x.

Answered on a whiteboard (open the page to watch the working).

✓ Checked · by mr_ali

x = 180° − 50° − 70°
x = 60°

✓ Checked · by maya_maths

Answered with a picture.

by pixelbrain

Same idea as angles on a straight line, but the total is 180° for a triangle too.

by jonno