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5. 4. 3. BLAST OFF!. 2. 1. CONTINUE. 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!.

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**5**4 3 BLAST OFF! 2 1 CONTINUE**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…**Triangle**A triangle is one of the basic shapes of geometry: a polygon with three corners and three sides which are straight line segments. • Next**A triangle has three angles. The sum of these three angles**always equals 180°. • Next**Mission:**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. Click on the triangle to continue**You recently learned about the different types of angles.**Obtuse angle Acute angle Right angle Straight angle • Next**These types of angles are also used to classify triangles.**Click on each to learn more. Right Triangle**Right Triangles**Right triangles are triangles that have a right angle (90°). 90° angle Continue**These types of angles are also used to classify triangles.**Click on each to learn more. Right Triangle Acute Triangle**Acute Triangles**Acute triangles are triangles that have angles less than 90°. Less than 90° Continue**These types of angles are also used to classify triangles.**Click on each to learn more. Right Triangle Acute Triangle Obtuse Triangle**Obtuse Angles**An obtuse triangle is a triangle that has one obtuse angle (an angle greater than 90°). Greater than 90° Continue**Now let’s review…**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°**GREAT JOB!**That is correct!! An obtuse triangle has an angle that is GREATER than 90°. Continue**Not Quite!!**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**GREAT JOB!**That is correct!! Triangles are classified by the lengths of their sides as well as the size of their angles. Continue**That is Incorrect!!**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. Click on the triangle to continue**You recently learned about the different types of angles.**Obtuse angle Acute angle Right angle Straight angle • Next**These types of angles are also used to classify triangles.**Click on each to learn more. Right Triangle**Right Triangles**Right triangles are triangles that have a right angle (90°). 90° angle Continue**These types of angles are also used to classify triangles.**Click on each to learn more. Right Triangle Acute Triangle**Acute Triangles**Acute triangles are triangles that have angles less than 90°. Less than 90° Continue**These types of angles are also used to classify triangles.**Click on each to learn more. Right Triangle Acute Triangle Obtuse Triangle**Obtuse Angles**An obtuse triangle is a triangle that has one obtuse angle (an angle greater than 90°). 180° Continue**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**CORRECT!!**Wow! You really know your stuff! Click on the yellow star to continue!**Oh Dear!**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. Click on the triangle to continue**You recently learned about the different types of angles.**Obtuse angle Acute angle Right angle Straight angle • Next**These types of angles are also used to classify triangles.**Click on each to learn more. Right Triangle**Right Triangles**Right triangles are triangles that have a right angle (90°). 90° angle Continue**These types of angles are also used to classify triangles.**Click on each to learn more. Right Triangle Acute Triangle**Acute Triangles**Acute triangles are triangles that have angles less than 90°. Less than 90° Continue**These types of angles are also used to classify triangles.**Click on each to learn more. Right Triangle Acute Triangle Obtuse Triangle**Obtuse Angles**An obtuse triangle is a triangle that has one obtuse angle (an angle greater than 90°). Greater than 90° Continue**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. Click on each to learn more. 1. Isosceles 3. Scalene 2. Equilateral**Isosceles Triangles**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**Equilateral Triangles**An Equilateral triangle is a triangle that has three equal sides. This means that all of the sides have the same length. NEXT**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°. NEXT**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**Scalene Triangles**A scalene triangle is a triangle that has three sides with different lengths. NEXT**Greetings Earthling!**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.

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