A 18-ft ladder leans against a building so that the angle between the ground and the ladder is $72 ^ { \circ }$ . How high does the ladder reach on the building?

Name: A 18-ft ladder leans against a building so that the angle between the ground and the ladder is $72 ^ { \circ }$ . How high does the ladder reach on the building?
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The Answer of A 18-ft ladder leans against a building so that the angle between the ground and the ladder is $72 ^ { \circ }$ . How high does the ladder reach on the building?

A 18-Ft Ladder Leans Against a Building So That the Angle