Find the Measure of the Dihedral Angle Indicated $40 ^ { \circ }$

question 60

Multiple Choice

Find the measure of the dihedral angle indicated.
-The figure shown is a right prism whose bases are regular nonagons. Find the measure of the dihedral angle between each lateral face and a base.

• A) \(40 ^ { \circ }\)
• B) \(144 ^ { \circ }\)
• C) \(140 ^ { \circ }\)
• D) \(90 ^ { \circ }\)

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