Classifying 2D Shapes

Classifying 2D Shapes

Explore polygons, triangles, quadrilaterals, parallelograms, rhombuses, rectangles and squares!

Polygons

Poll

Poll

On a scale of 1-4, how much do you know about polygons?

• 1

• 2

• 3

• 4

Pre-test

What are Polygons?

A polygon is a shape that does not have any curved or unconnected sides. All the sides are straight. Examples of polygons are below:

Draw

Draw a polygon.

Post Test

Multiple Choice

Which of these is a polygon?

Multiple Choice

A polygon is...

• A shape with straight sides

• A circle

Triangles

Pre Test

Multiple Choice

A triangle has...

• 3 sides

• 4 sides

• 5 sides

Fill in the Blanks

What are Triangles?

There are many different types of triangles. Today we will focus on Equilateral, Isosceles, and Scalene.

Different Types

A triangle has 3 sides. These sides can be different lengths, and the angles can differ also.

Triangles

An Equilateral triangle is a triangle where all the sides are the same length.

Equilateral

In an Isosceles triangle, 2 of the sides are the same length.

Isosceles

A Scalene triangle has no sides of the same length.

Scalene

​Link (Only listen to song): https://www.flocabulary.com/unit/types-of-triangles/

Post Test

Multiple Choice

Which of these is an Isosceles triangle?

• I have 2 sides of the same length.

• I have 3 sides of the same length.

• I have no sides of the same length.

Multiple Choice

Is this a Scalene triangle?

• Yes

• No

Multiple Choice

Is this an Isosceles triangle?

• Yes

• No

Quadrilaterals

Pre Test

Multiple Choice

A quadrilateral has...

• 4 sides

• 5 sides

What is a Quadrilateral?

A quadrilateral is a four-sided shape. If it has more than 4 sides, it is classified as a polygon.

Post Test

Draw

Draw a QUADRILATERAL.

Trapezoids

Pre Test

Multiple Choice

Is this a trapezoid?

• Yes

• No. A trapezoid looks like this!

What are Trapezoids?

If you got the Pre Test wrong, here's the reason why: A trapezoid is a shape with 1 pair of parallel sides. While it may look like this:

It can also look like this:

Parallelograms

Pre Test

Multiple Choice

A parallelogram has only 1 pair of parallel sides.

• True

• False

A parallelogram has 2 sets of parallel sides. The sides of a parallelogram do not have to be the same length.

Parallelogram

Post Test

Draw

Draw a PARALLELOGRAM.

Rhombuses

Pre Test

Multiple Choice

Which of these is a rhombus?

Rhombuses

A rhombus is a lot like a parallelogram, but it all of its sides are the same length. The angles do not have to be the same to be classified as a rhombus.

Post Test

Draw

Draw a RHOMBUS. It does not have to be perfect.

Rectangles

Pre Test

Draw

Draw a RECTANGLE

Rectangles

Rectangles are shapes with only right angles. A right angle is 90°. Each right angle is represented by a square.

Post Test

Square

Pre Test

Draw

Draw a SQUARE

What is a Square?

A square is the king of the hill. A square has 2 sets of parallel sides, 4 right angles and sides that are the same length. A square fits into the polygon, quadrilateral, parallelogram, rectangle and rhombus categories.

Multiple Choice

Is a square a parallelogram?

• Yes

• No

Thank you for participating. Have a good day!