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

9-20.

Mr. Wallis is designing a home. He found the plan for his dream house on the Internet and printed it out on paper. Homework Help ✎

  1. The design of the home is shown below. If all measurements are in millimeters, find the area of the diagram.
    Shape

    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

  2. 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?