Lesson 4 of 4 · Grade 7 Mathematics
Angles and data
18 min
Angle facts
- Angles on a straight line add up to 180°.
- Angles around a point add up to 360°.
- Vertically opposite angles are equal.
- Angles in a triangle add up to 180°.
- Types: acute (< 90°), right (= 90°), obtuse (between 90° and 180°), reflex (> 180°).
Example: two angles in a triangle are 50° and 70°. The third is 180 - 50 - 70 = 60°.
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