# LO: To find the formula for the area of rectangles, triangles and parallelograms.

## Area of Rectangles

#### Finding the area of rectangles is easy, all you have to do is multiply the length by the width. #### Another way of finding the area of a rectangle is using an array. An array means using rows and then adding it all up. If each row has 18 squares, if we have 6 rows, we would then go 6 x 18 which is 108 squares in total. ## Area of Triangles

#### Finding the area of triangles is easy, all you have to do is multiply the base by the height and half the answer. #### The reason for that is that is if I go base x height (or length x width) that is the same formula as the area of a rectangle. If you look at the picture below each of the triangles is only half of the size of a rectangle, which is why the formula is 1/2 x b x h. ## Area of Parallelograms

#### Finding the area of parallelograms is easy, all you have to do is multiply the base by the height. #### The reason for that is that is if I cut the end piece of the parallelogram, I can slide it to the opposite side and create a rectangle. The area of a parallelogram is the exact same as the area of a rectangle, which is length x width (or base x height). ## Teaching Ideas   