triangle concepts presentation

Concept AssignmentAmanda Stevens

EDT 512

Click here to begin!

Hello! I’m Larry the magical Leprachaun. I LOVE to learn and

explore. Come and take a trip with me and my magical hat. We will explore Mr. Harvey’s classroom. I think he is talking about triangles today. Come

along!!!

Click on my picture to move through the journey!

Good Morning Class! I am going to teach you about triangles today. I hope you enjoy our lesson! Let’s take a look at today’s problem!

Here we are in Mr. Harvey’s

classroom. He is teaching about triangles today!

Here we are in Mr. Harvey’s

classroom. He is teaching about triangles today!

This is today’s problem. I am

not sure how we are going to do

this.

I’m not sure what that

means. I hope he makes this

clear.

These are all right angle triangles. Mr.

Harvey told us these are corresponding.

That means they are equal.

Mr. Harvey labeled each corresponding angle for

us. Each triangle has three angles. A is a 90 degree angle and is the same in each triangle.

Angle B in each triangle is equal to

each other too. Equal angles cause corresponding sides.

Corresponding sides are

proportionate to each other. Mr.

Harvey will explain.

Mr. Harvey labeled all three sides of the

top triangle. If we know that the

bottom line equals 6 and the bottom line of the small triangle equals 3, the small triangle would be

half the size of the other triangle.

What are the other lines of

the small triangle?

You are right! The longer line equals 5. Half of 10 equals 5. Half of 8 equals 4. Remember the top triangle is twice the size of the bottom triangle. You are

starting to get the hang of this!

We can also figure out the

sides of the large triangle as well.

12 is twice as big as 6. So the sides of this triangle are

twice as large.

As usual, Mr. Harvey is going to show us how this relates to the real world. HERE WE GO!

OK class, you will need a meter

stick, pen and pencil.

Remember it needs to be

sunny, and don’t do this around

noon!

I hope you brought all our

materials outside for

this!

Hold your meter stick perpendicular to the ground so it makes a shadow just like the

flag pole.

I wonder how this will work.

Now measure the shadows of

the flag and meter stick.

OK!

These triangles are right angle

triangles. They both have right

angles! They are equal!

Corresponding angles have

corresponding sides.

I remember that from

class.

I measured the meter stick

shadow as 50 cm. That is half

a meter!

Good! Now measure the

shadow of the flag pole.

The other shadow is 2

meters. The flag pole triangle is four times the

size of the meter stick triangle.

So what is the height of the flag pole?

Good Job! The meter stick is 1 meter. The flag pole is 4 times larger. The flag pole is 4 meters

high.

Thanks Mr. Harvey and thanks to all you who came along! I hope you learned something today!