Angles in triangles (age 7+)
Recognise and draw shapes having specified attributes (e.g. a given number of angles or equal faces); identify triangles, quadrilaterals, pentagons, hexagons, and cubes
What a learner can do afterwards
- Draw a shape with exactly 5 sides (pentagon)
- Identify all quadrilaterals in a set of mixed shapes
- Name and draw a hexagon, explaining it has 6 sides and 6 angles
The lesson
You already know a triangle has 3 sides and 3 angles. Every straight-sided shape works the same way: the number of angles always matches the number of sides. A shape with 4 sides is a quadrilateral. A shape with 5 sides is a pentagon. A shape with 6 sides is a hexagon.
Zara sorts a pile of shapes. She picks up a square, a rectangle, and a kite. All three have 4 straight sides, so all three are quadrilaterals, even though they look different.
Some shapes are named for more than sides. A cube has 6 flat faces, and every face is the same size and shape. Look for what is equal, not just how many sides you see.
Sides and angles match: 4 sides make a quadrilateral, 5 make a pentagon, 6 make a hexagon.
Watch it
Where it sits
This opens up
Where this leads
Jobs that lean on this skill. Follow one to see everything it is built on.
8 questions wait behind this lesson, each with its answer explained. Every answer feeds the sky: stars light as they are learned, and dim when it is time to come back.