Grade 3 · Math · Unit 12 of 13
Sorting Polygons
Triangles, quadrilaterals, pentagons, hexagons and octagons, regular and irregular.
What your child practises
Practises naming polygons by their number of sides and sorting them as regular (all sides and angles equal) or irregular.
Prince Edward Island Curriculum curriculum outcome: SS7 · sorting regular and irregular polygons by their number of sides
How we explain it
Children can open this short lesson before they practise.
- A polygon is a closed shape with straight sides.
- Triangle 3 sides, quadrilateral 4, pentagon 5, hexagon 6, octagon 8.
- A polygon has as many corners as sides.
Example: How many sides does a hexagon have? Hexa- means 6. A hexagon has 6 sides. Answer: 6
Sample questions
A taste of this unit. In the app, questions change every time and get easier or harder to match your child.
Question 1
A stop sign has the shape of an…
- octagon
- pentagon
- hexagon
octagon
Hint: It has 8 sides.
Question 2
Sort: a polygon with 4 sides is a…
- quadrilateral
- triangle
- hexagon
quadrilateral
Hint: Four sides: quadrilateral.
Question 3
How many corners (vertices) does a pentagon have?
- 6
- 5
- 4
5
Hint: The number of corners equals the number of sides.
Question 4
A triangle with three equal sides is…
- regular
- irregular
- a quadrilateral
regular
Hint: All three sides match.
Question 5
How many sides does an octagon have?
- 6
- 10
- 8
8
Hint: A stop sign is an octagon.
Question 6
A shape has 8 equal sides and 8 equal angles. It is a…
- regular octagon
- irregular octagon
- regular hexagon
regular octagon
Hint: Eight equal sides and angles.