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en:proof-of-the-law-of-cosines [2017/07/14 10:34] federico |
en:proof-of-the-law-of-cosines [2017/07/14 10:36] federico |
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| {{:en:law-of-cosines2-fs8.png?nolink|}} | {{:en:law-of-cosines2-fs8.png?nolink|}} | ||
| - | |||
| - | {{:en:law-of-cosines3-fs8.png?nolink|}} | ||
| Using trigonometry, the sides of the green triangle are | Using trigonometry, the sides of the green triangle are | ||
| Line 17: | Line 15: | ||
| * (b sin θ) | * (b sin θ) | ||
| * (c - b cos(θ)) | * (c - b cos(θ)) | ||
| + | |||
| + | {{:en:law-of-cosines3-fs8.png?nolink|}} | ||
| Using the Pythagorean Theorem: | Using the Pythagorean Theorem: | ||