How do you find the area of an irregular shape

Regular shapes are shapes that have sides that are all equal and interior angles are also equal.

Irregular shapes are shapes that vary in the measurement of sides and interior angles.

To find the area of an irregular shape, break it down into various regular shape and individually compute its area. Add up all the area of the regular shapes formed from the irregular shape to get the area of the irregular shape.

An example of an irregular shape is the outline of a house. 

Pointed roof over a square room. There are two regular shapes found in this irregular shape. A square and a triangle. Compute its individual area and add up these two areas to get the area of the house.

Subtract 6 each time.

180 - 6 = 174

174 - 6 = 168

168 - 6 = 162

And so on.