# Introduction to Types of Triangles

Welcome to this video lesson on triangles. Today we’ll talk about equilateral, isosceles, and scalene triangles.

a) An equilateral triangle is a triangle with sides of equal length and every angle measuring 60°.

b) An isosceles triangle is a triangle with two sides of equal length and therefore two angles of equal measure, namely the angles opposite the two equal sides. A common isosceles triangle is the 45-45-90, where two angles are 45° and one is 90°. This is also a right triangle, since one of the angles is a right angle at 90°.

Remember, that no matter what, all the angles inside a triangle add up to 180°.

When finding the area of a triangle, The area of a triangle can be demonstrated as half of the area of a parallelogram which has the same base length and height, or the equation Area = 12bh here we can see how a triangle is only ½ of a parallelogram

I hope that helps. Thanks for watching this video lesson. Until next time, happy studying

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by Mometrix Test Preparation | Last Updated: August 15, 2019