# Interactive video lesson plan for: Geometric Shapes and Names

#### Activity overview:

Geometry Teachers Never Spend Time Trying to Find Materials for Your Lessons Again!

http://geometrycoach.com/Geometry-Lesson-Plans/?pa=MOOMOOMATH
In this video you will learn about common Geometric Shapes
Let’s take a look at many of the geometric shapes you will encounter in geometry classes.
We will begin with 2d shapes which have length and width, but no height.
2d shapes include polygons and curved shapes.
3d shapes have height, width, and depth.
These shapes can have straight lines or curves.
Let’s get started by looking at our first type of 2d shapes “polygons”
Polygons are 2-dimensional closed shapes.
A closed shape does not have any openings, and all of the lines connect.
You can’t leave the inside of a closed shape without crossing a line.
Polygons have straight lines and do not have curves
A polygon has three parts.
Straight Lines
Vertices which are the point at which the lines intercept
Angles are formed by intercepting lines
There are several types of polygons
A regular polygon has equal lines and angles
An irregular does not have equals lines and angles
A concave polygon has one angle greater than 180 degrees
A convex polygon does not have any internal angles greater than 180 degrees
A simple polygon does not have any lines that cross over.
A complex polygon has at least one line that crosses over itself
Polygon names
Named after the number of sides and angles
Triangle 3 sides
Pentagon 5
Hexagon 6
Heptagon 7
Octagon 8
Nonagon 9
Decagon 10
Hendecagon 11
Dodecagon 12
After 12 sides it is acceptable to give the number of sides and then gon
For example 14 gon has 14 sides
Curved 2d shapes have curved lines instead of straight lines.
Common examples of curved shapes include a circle,
an ellipse which looks like a circle that has been stretched or squashed
A crescent is also a curved 2d shape
3d shapes are shapes that have height, width and depth
A sphere and a cone are examples of 3d shapes
Many 3d shapes are considered polyhedrons.
Let’s take a look at the properties of polyhedrons
A polyhedron is a 3D solid figure in which each side is a flat surface composed of polygons.
What is a polyhedron?
A polyhedran is a 3D solid figure with a flat surface.
A polyhedran does not have any curved surfaces.
Polyhedron is derived from poly=many.
Hedron = Face so it means many faced geometric shape.
Is a Dodacahedron a polyhedron yes
Is a triangle a polyhedron? No is is only 2D
Is a sphere a polyhedron? No it has curves
Is a coffee mug a polyhedron? No
Some common examples of polyhedron are prisms and pyramids
Euler's Polyhedron states that the number of faces + number of vertices = number of edges + 2
A platonic solid is a convex Polyhedron that satisfy these three characteristics
All are regular polygons
All faces are congruent
All corners are congruent. The same number of faces meet at every vertex
3 Platonic solids are made of equilateral triangles
tetrahedron, octahedron, icosahedron
One platonic solid is made of squares
One platonic solid is made of pentagons
Cube 3 squares at each corner
6 square faces
Tetrahedron
3 equilateral triangles at each corner
4 triangle faces
Octahedron
4 equilateral triangles at each corner
8 triangle faces
Icosahedron
5 equilateral triangles at each corner
20 triangle faces
Dodecahedron
3 pentagons at each corner
12 pentagon faces

-~-~~-~~~-~~-~-
-~-~~-~~~-~~-~-

Tagged under: geometric shapes,plane shapes,polygons,polyhedrons,circle,square,properties,2d shapes,3d shapes,shapes

Clip makes it super easy to turn any public video into a formative assessment activity in your classroom.

Add multiple choice quizzes, questions and browse hundreds of approved, video lesson ideas for Clip

Make YouTube one of your teaching aids - Works perfectly with lesson micro-teaching plans

Play this activity

1. Students enter a simple code

2. You play the video

3. The students comment

4. You review and reflect

* Whiteboard required for teacher-paced activities

## Ready to see what elsecan do?

With four apps, each designed around existing classroom activities, Spiral gives you the power to do formative assessment with anything you teach.

Quickfire

Carry out a quickfire formative assessment to see what the whole class is thinking

Discuss

Create interactive presentations to spark creativity in class

Team Up

Student teams can create and share collaborative presentations from linked devices

Clip

Turn any public video into a live chat with questions and quizzes

### Spiral Reviews by Teachers and Digital Learning Coaches

@kklaster

Tried out the canvas response option on @SpiralEducation & it's so awesome! Add text or drawings AND annotate an image! #R10tech

Using @SpiralEducation in class for math review. Student approved! Thumbs up! Thanks.

@ordmiss

Absolutely amazing collaboration from year 10 today. 100% engagement and constant smiles from all #lovetsla #spiral

@strykerstennis

Students show better Interpersonal Writing skills than Speaking via @SpiralEducation Great #data #langchat folks!