Chapter 11.1B, Problem 8A

ASSESSMENT

The following figure is a box in which the top and bottom are rectangles with $\overline{BF}$ and $\overline{DH}$ perpendicular to planes $FGH$ and $BCD.$

a. Find the intersection of $\stackrel{\leftrightarrow }{BH}$ and plane $DCG.$

b. Name two pairs of perpendicular planes.

c. Name two lines that are perpendicular to plane $EFH.$

d. What is the measure of dihedral angle $D\text{-}HG\text{-}F$?