Why you have to multiply the base and length and divide it by two.
When you multiply the base and length of a triangle you get either the area of a square or a rectangle, (depending on the shape of the triangle). But if you want to get the area of the triangle you divide it by two. This is because when you half the rectangle or square you get the triangle.
The formula:
Multiply the base and length, then half it/divide by two
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