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A-8.

Copy the following figures onto your paper. Then find the area and perimeter of each shape, assuming that all corners are right angles. Be sure to show all of your work.

  1. An enclosed figure: Starting at the upper left corner: right 16, down 12, right 19, down 13, left 35, up 25 to enclose the figure.

    To find the area, separate the shape into two boxes, find the area of the two sections, and then add them together for the total area.

    The same enclosed figure which is divided into 2 rectangles by extending the 19 unit horizontal line to the left.

    16 · 12 = 192
    13 · 35 = 455
    Area = 192 + 455

    Area = 647

    To find the perimeter (the distance around a shape) add up all of the sides of the shape.

    perimeter = 16 + 12 + 19 + 13 + 35 + 25

    perimeter = 120

  1. An enclosed figure: Starting at the upper left corner: right 12, down 8, right 7, down 8, left 12, up 8, left 7, up 8 to enclose the figure.

    Follow the same strategy outlined in part (a).

    Using the figure drawn in A-8(b), create two rectangles from the figure by drawing a horizontal line between the two 7 unit line segments.