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Home > CC1 > Chapter 8 > Lesson 8.1.4 > Problem 8-54


Find the area of the shape below. All angles are right angles.  

An enclosed figure: Starting at the upper left corner: right 6, down 15, right, an unknown amount, up, an unknown amount, right 9, down 9, left 24, up 18 to enclose the figure.

To find the area of the entire shape, separate it into rectangles.

One way to divide the shape up is to make a cm by cm rectangle, a cm by cm square, and a rectangle with unknown sides. To find its length, you must subtract the cm side from the cm parallel to it. To find its width, you must subtract the vertical cm side from cm side.

Find the areas of the rectangles and add them together.

The area of the shape is square centimeters.

The same figure with a  horizontal rectangle drawn in the lower left corner, with the top edge as the  unknown horizontal side, extended to the left, Added alt text. Renae the right edge as the unknown vertical side, extended down.