The area of a polygon is the number of square units inside that polygon. Area is 2dimensional like a carpet or an area rug. A triangle is a threesided polygon. We will look at several types of triangles in this lesson. To find the area of a triangle, multiply the base by the height, and then divide by 2. The division by 2 comes from the fact that a parallelogram can be divided into 2 triangles. For example, in the diagram to the left, the area of each triangle is equal to onehalf the area of the parallelogram.
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