### Home > CCG > Chapter 9 > Lesson 9.1.2 > Problem 9-20

9-20.

The design of the home is shown at right. If all measurements are in millimeters, find the area of the diagram.

Divide the shape into smaller, easier shapes.

There is a

triangle. The height is and the base is . By subtracting the base of the triangle from

, you can find the length of the rectangle. Area

Mr. Wallis took his home design to the copier and enlarged it

%. What is the area of the diagram now? Show how you know. If the design is enlarged by

%, how many times bigger is the shape? How does the area of the new shape change?