Homework Help: Pre-Calculus-Trig

Posted by Chloe Mack on Sunday, January 30, 2011 at 7:40pm.

A road rises 140 feet per horizontal mile. What angle does the road make with the horizontal?

Pre-Calculus-Trig - helper, Sunday, January 30, 2011 at 9:16pm
Draw a triangle.

The the road would be the base, which is 1 mile or 5280 feet and the side opposite angle A would be 140.

You need angle A. You have side a = 140 feet, and side b = 5280 feet.

tan A = opp/adj = a/b = 140/5280
tan A = 140/5280 = ?
arctan ? = angle A

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