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

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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

30 0 55 0 72 0 63 0 53 0

30 0 55 0 72 0 63 0 51 0 60 0 35 0 18 0 27 0 39 0

180 0

50 0 ?0?0 130 0

55 0 60 0 115 0 35 0 112 0

55 0 60 0 115 0 35 0 112 0 125 0 120 0 65 0 68 0 145 0

360 0

55 0 305 0

55 0 215 0 90 0 + 55 0 = 145 0 360 0 – 145 0 = 215 0

85 0 275 0 115 0 245 0 85 0 50 0 75 0 190 0 145 0

ruler

The sum of the angles in a triangle is 180 0

85 0 50 0 ? 85 0 + 50 0 = 135 0 180 0 – 135 0 = 45 0 ? = 45 0

The sum of the angles in a triangle is 180 0 110 0 30 0 ? 30 0 + 110 0 = 140 0 180 0 – 140 0 = 40 0 ? = 40 0

The sum of the angles in a triangle is 180 0 52 0 55 0 ? 55 0 + 52 0 = 107 0 180 0 – 107 0 = 73 0 ? = 73 0

The sum of the angles in a triangle is 180 0 60 0 75 0 ? 75 0 + 60 0 = 135 0 180 0 – 135 0 = 45 0 ? = 45 0