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Added a method (#23954)

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koreandude555
2018-12-12 02:19:31 -06:00
committed by Aditya
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commit e99601d263
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guide/english/mathematics/area-of-a-triangle/index.md
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@ -5,7 +5,7 @@ title: Area of a Triangle
<!-- The article goes here, in GitHub-flavored Markdown. Feel free to add YouTube videos, images, and CodePen/JSBin embeds --> <!-- The article goes here, in GitHub-flavored Markdown. Feel free to add YouTube videos, images, and CodePen/JSBin embeds -->
## Area of a Triangle ## Area of a Triangle
A triangle is a three sided, two dimensional polygon. There are two methods to determine the area. A triangle is a three sided, two dimensional polygon. There are three methods to determine the area.
### Method 1 ### Method 1
The area of a triangle can be calculated by multiplying 0.5 to the base length to the perpendicular height. The area of a triangle can be calculated by multiplying 0.5 to the base length to the perpendicular height.
@ -27,6 +27,19 @@ Mathematically this is expressed as:
Note that the formula expressed above uses sides a and b and angle C between them. These can be substituted for another other two sides and the angle between them. Note that the formula expressed above uses sides a and b and angle C between them. These can be substituted for another other two sides and the angle between them.
### Method 3
If only the length of the sides are known, we can use what is known as Heron's formula to find the area.
![Triangle-3](https://github.com/uuykay/misc/blob/master/area-triangle-image-3.jpg)
Mathematically this is expressed as:
![Formula-3](https://wikimedia.org/api/rest_v1/media/math/render/svg/d138044bb9ed870dd9dc5c7c8a3c07ab1db1705d)
Where s is half the perimeter, or
![Formula-3.1](https://wikimedia.org/api/rest_v1/media/math/render/svg/08ed8a6e351198e0c4ca8d71fa2e2bc4171e9439)
### Terminology ### Terminology