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Grade 2 · Maths · Lessons
Naming shapes, counting corners
🔺triangle⬜quadrilateral⬠pentagon⬡hexagon
Shapes around us.
The big ideaCount the angles: three, triangle; four, quadrilateral; five, pentagon; six, hexagon.

How it works

Count the sides and corners to name a flat shape: 3 triangle, 4 quadrilateral, 5 pentagon, 6 hexagon.

Solid shapes have faces. A cube has 6.

A shape stays the same shape when you turn it.

3 and 4• 3 sides: triangle• 4 sides: quadrilateral5 and 6• 5 sides: pentagon• 6 sides: hexagon
Sides and names.

Example 1: Count the sides

  1. A shape has 5 straight sides.
  2. Touch each side as you count: 1, 2, 3, 4, 5.
  3. A shape with 5 sides is a pentagon.

Example 2: A turned shape

  1. A triangle is turned on its side.
  2. Count the sides: 3.
  3. Turning does not change a shape. It is still a triangle.

Example 3: Faces of a solid

  1. A cube is a solid shape. Its flat sides are called faces.
  2. There is a top, a bottom and 4 around the sides: 1 + 1 + 4 = 6.
  3. A cube has 6 faces.

Words to know

side
A straight edge of a flat shape.
face
A flat surface of a solid shape.
angle
Where two sides meet, a corner.

Watch out

Try it

  1. How many sides does a hexagon have?
  2. What is a shape with 3 sides called?
  3. How many faces does a cube have?
  4. A shape has 5 sides. What is it called?
Answers: 1. 6 · 2. a triangle · 3. 6 · 4. a pentagon
For grown-upsGo on a shape hunt around the house: how many sides can your child find on a window or a book?
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