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Greeting space cadet! I am Captain Stargaze. Today I have a very important mission for you. Princess Twilight has been captured by the Knight of Polygon, and I need your help to rescue her! Click on the planet to see what your mission is!

The planet of Polygon is divided into several different countries. Princess Twilight is being held captive in Triangular, a land of triangles. What is a triangle you ask? Click on the star to find out…

A triangle is one of the basic shapes of geometry: a polygon with three corners and three sides which are straight line segments.

A triangle has three angles. The sum of these three angles always equals 180°.

Your mission is to research and learn about triangles to prepare to rescue Princess Twilight. Pay careful attention to the way that triangles are classified! If you chose to accept this mission, you must board the space ship by Clicking on it….

There are two different ways to classify triangles: By the lengths of their sides. And by the size of their angles.

You recently learned about the different types of angles. Right angle Acute angle Obtuse angle Straight angle

These types of angles are also used to classify triangles. Click on each to learn more. Right Triangle

Right triangles are triangles that have a right angle (90°). 90° angle

These types of angles are also used to classify triangles. Click on each to learn more. Right Triangle Acute Triangle

Acute triangles are triangles that have angles less than 90°. Less than 90°

These types of angles are also used to classify triangles. Click on each to learn more. Right Triangle Acute Triangle Obtuse Triangle

An obtuse triangle is a triangle that has one obtuse angle (an angle greater than 90°). Greater than 90°

Click on the BIG star to continue.

An obtuse triangle is a triangle that has one angle that is… Less than 90° Equals 90° Greater than 90° Equals 180°

That is correct!! An obtuse triangle has an angle that is GREATER than 90°. Continue

Let’s try that one again… Remember…what does the word “obtuse” mean? Click on the triangle to try again.

Triangles can be classified by the lengths of their sides and…. The size of their angles The shape that the make The amount of angles they have The color of the triangle

That is correct!! Triangles are classified by the lengths of their sides as well as the size of their angles. Continue

Maybe we should take another look at this…. Click on the face above to continue.

There are two different ways to classify triangles: By the lengths of their sides. And by the size of their angles.

You recently learned about the different types of angles. Right angle Acute angle Obtuse angle Straight angle

These types of angles are also used to classify triangles. Click on each to learn more. Right Triangle

Right triangles are triangles that have a right angle (90°). 90° angle

These types of angles are also used to classify triangles. Click on each to learn more. Right Triangle Acute Triangle

Acute triangles are triangles that have angles less than 90°. Less than 90°

These types of angles are also used to classify triangles. Click on each to learn more. Right Triangle Acute Triangle Obtuse Triangle

An obtuse triangle is a triangle that has one obtuse angle (an angle greater than 90°). 180°

There are three different types of triangles that are classified by the size of angles: Acute, obtuse, and … Isosceles triangle Straight triangle 90° triangle Right triangle

Wow! You really know your stuff! Click on the yellow star to continue!

Maybe we should take another look at this…. Click on the face above to continue.

An obtuse triangle is a triangle that has one obtuse angle (an angle greater than 90°). Greater than 90°

Alright, you are doing a great job so far! Let’s continue on…. Click on the star to continue.

You can also classify triangles by the length of their sides. There are three different types of triangles. 1. Isosceles 3. Scalene 2. Equilateral Click on each to learn more.

An Isosceles triangle is a triangle that has TWO sides that are the same length. Click on star to continue

You can also classify triangles by the length of their sides. There are three different types of triangles. Click on each to learn more. 1. Isosceles 3. Scalene 2. Equilateral

An Equilateral triangle is a triangle that has three equal sides. This means that all of the sides have the same length.

Equilateral triangles not only have three equal sides, but they have three angles that are equal as well. The angles of an equilateral triangle equal 60° each. If you add all three angles together, it equals 180°.

You can also classify triangles by the length of their sides. There are three different types of triangles. Click on each to learn more. 1. Isosceles 3. Scalene 2. Equilateral

A scalene triangle is a triangle that has three sides with different lengths.

This is your FIRST challenge in rescuing the princess. Think hard about your answer! Click on the creature above to continue.

Select the isosceles triangle… Remember: An isosceles triangle is a triangle with two equal sides.

Great job! You really know your stuff! You are one step closer to rescuing the princess! Click on the face to continue!

I’m sorry, that is not correct. Let’s try that one again! Click on the face above to continue.

Select the angle that equals 90° and is used to create a right triangle. Click the letter to choose you answer.

That’s right! You sure know how to classify triangles by angles! Click on the space creature to continue.

No, that is not right! Take another look at the angles. I know you know this! Click on the face to go back and try again.

Well, Earthling. It looks like you really know your stuff. But will it be enough to rescue the princess? I guess we shall see….. Click on the BIG star to continue.

This is a type of triangle that has angles that are less than 90°. Isosceles triangle Acute triangle Obtuse triangle Right triangle

I am so glad that I picked you to help rescue the princess! Click on the rocket to continue.

Click on the face to continue.

These types of angles are also used to classify triangles. Click on each to learn more. Right Triangle

Right triangles are triangles that have a right angle (90°). 90° angle

These types of angles are also used to classify triangles. Click on each to learn more. Right Triangle Acute Triangle

Acute triangles are triangles that have angles less than 90°. Less than 90°

These types of angles are also used to classify triangles. Click on each to learn more. Right Triangle Acute Triangle Obtuse Triangle

An obtuse triangle is a triangle that has one obtuse angle (an angle greater than 90°). Greater than 90°

A scalene triangle…. Is a triangle that has three sides with different lengths. Is a triangle is a triangle that has two sides that are the same length. Is a triangle that has three equal sides. This means that all of the sides have the same length.

That won’t help in trying to save the princess!!

You are really getting the hang of this! Good Job! Click the face to continue.

You have one more question to answer to save the princess from the evil Knight of Polygon! Be sure to answer carefully. GOOD LUCK! Click on the princess to answer the final question!

What is ALWAYS the sum of all three angles of any triangle? 90° 180 ° 360 ° 270 °

Come on! I know you know this! Let’s review some information about triangles…. Click the triangle to continue.

A triangle is one of the basic shapes of geometry: a polygon with three corners and three sides which are straight line segments.

A triangle has three angles. The sum of these three angles always equals 180°.

Job well done, my friend! Click on Captain Stargaze to continue…

You have successfully rescued Princess Twilight from the Knight of Polygon! Well done! The End

Press ESC to exit.