Year 6 Maths reasoning (SATs) · Geometry: angles and shapes · Summary
Year 6 Maths reasoning (SATs) Geometry: angles and shapes: summary and key words
Part of the Year 6 Maths reasoning (SATs) geometry: angles and shapes chapter. Chapter overview · whole chapter on one page
Chapter summary
| Skill | Method |
|---|---|
| Angles at a point | Add to 360 degrees. |
| Angles on a straight line | Add to 180 degrees. |
| Vertically opposite | Angles opposite each other at a crossing are equal. |
| Triangle | The three angles add to 180 degrees; isosceles has two equal base angles. |
| Quadrilateral | The four angles add to 360 degrees. |
| Polygon | Angles inside add to (n - 2) x 180; regular: all sides and angles equal. |
| Circle | Diameter = 2 x radius. |
| Angle types | Acute < 90; right = 90; obtuse 90 to 180; reflex 180 to 360. |
Can you…?
- I can find missing angles at a point, on a straight line and vertically opposite
- I can find missing angles in a triangle and in a quadrilateral
- I can use the angle sum of a polygon, and of a regular polygon
- I can classify shapes by their properties and say why
- I can name faces, edges and vertices of a 3-D shape
- I can disprove a statement with a counter-example
Key terms
- acute angle
- an angle less than 90 degrees
- obtuse angle
- an angle between 90 and 180 degrees
- reflex angle
- an angle between 180 and 360 degrees
- regular polygon
- a shape with all sides and all angles equal
- isosceles triangle
- a triangle with two equal sides and two equal angles
- counter-example
- one example that shows a statement is false