|Heron's formula is used to calculate the area A of a triangle where the lengths of all three sides are given.
Note: Heron's formula is not used when the height of the triangle is known - too much work!
Interactivity: Heron's formula Directions for interactivity
1. Click and drag the sliders to change \triangle ABC .
2. Click and drag the point C to move and the point a A to rotate.
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