Angles in triangles
I know that the angles in a triangle sum to 180°.
Angles in triangles
I know that the angles in a triangle sum to 180°.
Lesson details
Key learning points
- Angles on a straight line sum to 180 degrees.
- Interior angles in triangles sum to 180 degrees.
- Missing angles can be calculated using the sum of 180 degrees.
Keywords
Quadrilateral - A quadrilateral is a polygon with four straight sides and four vertices.
Triangle - A triangle is a polygon with three straight sides and three vertices.
Sum - The sum is the result of adding two or more numbers.
Common misconception
Pupils struggle to remember the number of degrees in a triangle as they only know it as a disconnected fact.
Apply pupils' knowledge of angles in a quadrilateral to understanding the sum of the angles in a triangle. Spend time showing how a quadrilateral is constructed using triangles and what happens to the angles as the quadrilateral is partitioned.
Licence
This content is © Oak National Academy Limited (2024), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).
Lesson video
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Starter quiz
6 Questions
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