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Kindergarten · Maths · Lessons
Sides and corners
🟦square🔺triangle👆touch🔢count
Sides and corners.
The big ideaTouch each side once. Big or small, turned or not, the count stays the same.

How it works

Touch each side once. Big or small, turned or not, the count stays the same.

A triangle has 3 sides and 3 corners. A square has 4 sides and 4 corners.

A corner is where two sides meet.

Triangle• 3 sides• 3 cornersSquare• 4 sides• 4 corners
Sides and corners.

Example 1: Sides

  1. Touch each side of a triangle once.
  2. 1, 2, 3.
  3. A triangle has 3 sides.

Example 2: Corners

  1. Touch each corner of a square.
  2. 1, 2, 3, 4.
  3. A square has 4 corners.

Example 3: Turned and big

  1. A big turned square.
  2. Count its sides again.
  3. Still 4.

Words to know

side
A straight edge.
corner
Where two sides meet.

Watch out

Try it

  1. How many corners does a triangle have?
  2. How many sides does a square have?
  3. Does a big square have more sides than a small one?
  4. Where do two sides meet?
Answers: 1. 3 · 2. 4 · 3. no · 4. at a corner
For grown-upsTrace a shape with your finger and count each side and corner.
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