Types of Triangles

Triangles

Welcome to your enjoyable triangle lesson 

This lesson will introduce the meaning of triangles, and the types of triangles according to two things: sides and angles.

Before you begin this lesson, please watch this video to take a breif idea about triangles.

[video:https://youtu.be/r4rySgvfDQU align:center]

The process for this lesson will be easy and focused on the types of triangles according to their sides and angles. You will be required to read the definitions very well, enjoy playing the educational games, and do the final online exercises to make sure that you understand the lesson.

 Please move to the process section to know more about the types of triangles in details.

 what are Triangles:

Triangles are three sided polygons. One of the most interesting things about triangles is that if you sum up the three angles within any triangle, they will always total 180 degrees.

There are several types of triangles:

Some triangles can be described by their sides, like the equilateral, isosceles, and scalene triangles.

Equilateral Triangle

The equilateral triangle is a triangle with sides that are all the same length. The three interior angles are all the same too. If we use what we learned above, that all the angles must total 180 degrees, then each angle in an equilateral triangle is 180/3 = 60 degrees 

Isosceles Triangle

An isosceles triangle is a triangle with two equal sides. As a result of 

having two equal sides, two of the angles will be the same too. 

Scalene Triangle 

A scalene triangle is one where none of the sides are the same length.

Enjoy playing triangle shoot game to see if you understand this part of triangles classification according to sides:      

http://www.sheppardsoftware.com/mathgames/geometry/shapeshoot/triangles…

 Some triangles are described by their angles like the right, obtuse, and acute triangles.

Right Triangle

 The right triangle is one where one of its angles is 90 degrees. This type of triangle has some unique properties that are important to geometry including the Pythagorean Theorem. Triangles that are not right triangles, or don't have one 90 degree angle, are called oblique.

Obtuse Triangle

An obtuse triangle is the opposite of an acute triangle in that it is a triangle where one angle is greater than 90 degrees. Acute and obtuse triangles are both oblique. 

Acute Triangle

An acute triangle is a triangle where all the interior angles are less than 90 degrees. 

Enjoy Playing Drag and Drop game to see if you understand the classification of triangles according to angles:     

http://www.math-play.com/classifying-triangles/Triangles-Drag-and-Drop-…

Now test your knowledge about types of triangles by doing those  enjoyable online excercises :

Excercise 1:

http://www.sporcle.com/games/g/triangletypes

Excercise 2:

http://www.softschools.com/quiz_time/math/geometry/theme1.html

Good Job you have completed the lesson. You have learned the definition of triangle and the different types of triangles that have been classified according to their properties.

This is a good summary for what have you took in this lesson:

Best of luck :)