What is Area?Area is the amount of space inside a shape. It is measured in square units. If you place a shape on a grid, the area is the number of squares that can fit inside the shape.
Instead of counting squares, you can also use a formula to find the area of a rectangle. The formula for the area of a rectangle is Area = length x width. For the rectangle above, we could have also multiplied 4 x 3 to find the area.
What would happen if we cut a rectangle in half to form a triangle? What would the new area be? The area of the rectangle is 12 square units. If the rectangle has been cut in half to form two equal triangles, then each triangle must have 1/2 the area of the rectangle. This means we can take 1/2 of 12 to find the area of the triangle, so the area is 6 square units. 

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