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- April 4th 2008, 11:25 AM #1

- Joined
- Mar 2008
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- 12

- April 4th 2008, 11:35 AM #2

- April 4th 2008, 11:49 AM #3
There are two methods. I've showed both.

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1st method, Heron's Formula:

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2nd method, Geometry:

**EDIT:**I have attached a diagram so you can see how it is geometrically.

Find the height by using Pythagoras and then use the standard triangle area formula.

---------(1)

--------------(2)

(2) - (1)

Solve for :

Substitute value into formula (1) or (2) to get .