Objective: Know the sum of angles at a point, on a straight line and in a triangle. Vocabulary:

90 0

40 0 ?0?0 50 0

180 0

50 0 ?0?

360 0

= – = 215 0

ruler

The sum of the angles in a triangle is 180 0

? = – = 45 0 ? = 45 0

The sum of the angles in a triangle is ? = – = 40 0 ? = 40 0

The sum of the angles in a triangle is ? = – = 73 0 ? = 73 0

The sum of the angles in a triangle is ? = – = 45 0 ? = 45 0

Thank you for your attention