seegongsik
Grade 2 (age 7-8)

grade 2 Shapes Classification

All around us hide shapes like triangles, quadrilaterals, and circles. A roof is a triangle, a window is a quadrilateral, and a coin or pizza is a circle. You can tell them apart by counting corners and sides: a triangle has 3 of each, a quadrilateral has 4, and a circle is round with none. Pick a shape to study its vertices and sides, then hunt for shapes in everyday objects.

Shapes around us

👀 Shapes are everywhere
①Roofs have triangles, and windows have quadrilaterals
②Coins and pizzas are circles
③Look around carefully and you'll find shapes everywhere

What makes each shape

Triangle
💡 How to tell shapes apart
①The numbered red dots in the picture are the vertices
②A straight line joining two vertices is a side
③A triangle has 3 vertices and 3 sides
④A quadrilateral has 4 vertices and 4 sides
⑤A circle is round, with no vertices or sides, and has a center in the middle

Finding shapes in everyday things

All shapes
🏠 Where can you find them?
①Pick a shape to find, and only the things with that shape are colored in and labeled
②Triangles: the roof, the pizza slice, the sign
③Quadrilaterals: the wall, the window, the book
④Circles: the bicycle wheels, the pizza

Wrap-up

Triangle
3 vertices + 3 sides = triangle
A shape enclosed by three straight lines
Quadrilateral
4 vertices + 4 sides = quadrilateral
A shape enclosed by four straight lines
Circle
0 vertices + 0 sides = circle (a round shape)
A round shape whose edge is the same distance from the center all the way around
🎯 Remember
①A vertex is a point where two sides meet
②A side is a straight line joining two vertices
③A triangle has 3 of each, and a quadrilateral has 4 of each
④A circle has no vertices and no sides

Examples and unit check

Example 1
What is the name of a shape with 3 vertices and 3 sides?
1
Tell shapes apart by counting their vertices and sides.
2
A shape with 3 vertices and 3 sides is a triangle.
▸ A triangle
A triangle is made of 3 vertices and 3 sides.
Example 2
How many vertices and sides does a quadrilateral have?
1
A quadrilateral is enclosed by four straight lines.
2
It has 4 sides, and 4 vertices where the sides meet.
▸ 4 vertices and 4 sides
In a shape with straight sides, there are as many vertices as sides. A circle has neither.
Unit check
Which round shape has no vertices and no sides?
①triangle
②quadrilateral
③circle
④pentagon
▸ ③ circle
1
A circle is made of one round curve.
2
A circle has no straight sides and no vertices at all.
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Multiplication Table
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Length Measurement

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