Chapter 55, Problem 10A

Lay out a figure as follows:
a. Draw a horizontal line and mark off a distance of $2\frac{1}{2}$ inches. Label the left endpoint of the $2\frac{1}{2}$ -inch line segment point A and label the right endpoint point D.
b. From point A and above point A, construct a perpendicular to AD. Mark off a distance of $1\frac{7}{8}$ inches on the perpendicular from point A. Label the top endpoint point B.
c. From point B and to the right of point B, construct a perpendicular to AB. Mark off a distance of $2\frac{1}{2}$ inches on the perpendicular from point B. Label the right endpoint point C.
d. From point C and below point C, construct a perpendicular to BC. Mark off a distance of $1\frac{7}{8}$ inches on the perpendicular from point C. If your constructions are accurate, the $1\frac{7}{8}$ -inch distance marked off coincides with point D. What kind of a figure is formed by this construction?