### Question Description

# Congruent Triangles

You have learned five ways to prove that triangles are congruent: SSS, SAS, ASA, AAS, and HL. You are going to model these theorems with string and a protractor.**Example**: Recreate the following triangle using HL.

- HL requires a right angle, so use a protractor to create a right angle.
- Choose a leg of the original right triangle. Cut a piece of string the length of that leg.
- Lay the string along the corresponding leg of the right angle that you drew in Step 1 and make the leg the same length as the string by either extending the side or erasing part of the side.
- Cut a piece of string the length of the hypotenuse of the original right triangle.
- Lay one end of the string at the top of the leg that you created in Step 3. Make the other end of the string intersect the other side of the right angle, forming a triangle. Trace the string. Make the bottom leg of the triangle the correct length by either extending the side or erasing part of the side.
- You’ve now copied the triangle using HL.
# Proving Triangles Congruent

Complete the following table to summarize the different ways to prove triangles congruent.Postulate/Theorem What It Says Required Information Picture SSS If the three sides of one triangle are congruent to the three sides of another triangle, then the triangles are congruent. three sets of congruent sides SAS ASA AAS HL

You will turn in the chart above.# Recreating the Original Triangle

You will be using the following original triangle in the following activity.

With a ruler, measure the sides of the original triangle to the nearest millimeter. Write down the length of each side in your math journal.With a protractor, measure the angles of the original triangle to the nearest degree. Write down the measure of each angle in your math journal.

SSS: Cut three pieces of string. Make each piece of string the length of one of the sides of the original triangle. Put the string together to form a triangle and trace the triangle on a separate piece of paper. Measure the angles of the triangle with your protractor.Answer the following questions in your math journal:- Are the lengths of the sides and the measures of the angles of the triangle you created the same as the original triangle?
- Rearrange the string to make a different triangle. Is there any way to create a triangle that has different angle measures?

- Are the lengths of the sides and the measures of the angles of the triangle you created the same as the original triangle?
- Draw the starting angle elsewhere on your paper and rearrange the string to make a different triangle. Is there any way to create a triangle whose third side has a different length?

- Are the lengths of the sides and the measures of the angles of the triangle you created the same as the original triangle?
- Rearrange the string and re-draw the two starting angles to make a different triangle. Is there any way to create a triangle that has different side lengths?

## You will need to submit the following:

- the answers to questions 1–6 above
- your re-drawn triangles with the pieces of string that you cut taped to each drawing
## You will need to submit the following:

- the steps that you would follow to recreate a triangle using a protractor, a string, and the AAS Congruence Theorem, written in your own words

## At the end of the assignment, you will need to submit the following:

- a chart summarizing all of the postulates and theorems that can be used to prove two triangles congruent
- the answers to six questions about recreating a triangle using a protractor, string, and the SSS, SAS, and ASA Congruence Postulates
- three drawings of recreated triangles, with the string used to create the drawings taped to the appropriate drawing
- a description of the steps that you would follow to recreate a triangle using a protractor, a string, and the AAS Congruence Theorem, written in your own words

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## Final Answer

Here is my answer to your assignment

The chart is shown below:

Postulate/T

heorem

SSS

What It Says

Required Information

three sets of

congruent sides

SAS

two sets of congruent

sides and one set of

equal angles

ASA

two sets of equal

angles and one set of

congruent sides

AAS

two sets of equal

angles and one set of

congruent sides

Picture

HL

two sets of congruent

sides

Answer to SSS questions:

1. Are the lengths of the sides and the measures of the angles of the triangle you created the

same as the original triangle?

According to SSS postulate/theorem, the original triangle and the newly created triangle are

congruent to each other since there are three pairs of congruent sides.

Therefore, all of the length of the sides and the measures of the angle I have created are the same

as the corresponding part of original triangle.

2. Rearrange the string to make a different triangle. Is there any way to create a triangle that

has different angle measures?

Since the original triangle and the newly created triangle are congruent due to SSS, each of the

angles in the original triangle will be equal to its corresponding angle in the newly created

triangle. Thus, there is no way to rearrange the string to create a triangle that has different angle

measures.

Answer to SAS questions:

1. Are the lengths of the sides and the measures of the angles of the triangle you created the

same as the original triangle?

According to SAS postulate/theorem, the original triangle and the newly created triangle are

congruent to each other since there are two pairs of congruent sides and the included angles of 2

triangles are also congruent.

Therefore, all of the length of the sides and the measures of the angle I have created are the same

...

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