Deriving the Area of a Triangle using Trigonometry

The area of the triangle is half the product of its base and altitude. In the figure below for instance, the area  of the two triangles with base and altitude is given by the formula .   In this post, we derive the area of a triangle using trigonometry In particular, we want to compute […]
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Using the Area of a Rectangle to Derive the Area of a Triangle

The area of a rectangle is the product of its base and its height. We will use this fact to derive the area of a triangle. If we can show that the area of the rectangle and the area of a triangle are related, then we can find the formula. To show the relationship between […]
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