Area of Triangle

Introduction

In this lesson, we will learn how to calculate the area of triangles. This is very easy and quick topic as long as you know the formula for finding the area of a triangle. So, let's review the formula and get started!

Formula for Area of Triangle

b x h x 1/2

Area of Triangle

Let's say we have a triangle with the following measurements:

In order to find the area of the above triangle, we need to multiply 12 x 10 x 1/2

12 x 10 equals 120 x 1/2 equals 120/1 x 1/2 equals 120/2 equals 60.

The area of the triangle equals 60 inches to the power of 2.

Calculating Perimeter

Preview

Calculating perimeter is actually really easier than it looks because all you are doing is adding lengths of all sides of shape.To find a perimeter you need a two-dimensional shape. So let's say we have to find the perimeter of a lawn which is in the shape of a rectangle.To find the perimeter we need measurements and so let's say that the measure of two sides are 21 feet and the the other two sides are 32 feet. Now to find the perimeter we need to add all the measurements like this:
  21     32       64
+21  + 32     +42
-----  ------   ------
  42     64     106
So now we know that the total answer is 106 feet that is the total perimeter.
Now try some of these and make sure to watch the video on YouTube.

Sheet 1 How to Calculate Perimeter