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Teachers' Lounge Discussion: Trigonometry Ratios

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From: Ross

To: Teacher2Teacher Public Discussion
Date: 2004012621:35:31
Subject: Trig Delema! am i crazy???

OK. you have a big triangle...the left angle is 25...the right is 15...the top is 140... you have a line coming from the top angle going down and touching the bottom...it's perpendicular (the angles where it touch make 90 degrees)...on the left triangle: the bottom side is 1.5...on the right triangle: the bottom side is 3.5 ... you want to solve for the length of the line coming from the top going down (that you just drew)... if you use the left triangle: 1.5 x tan(25) = .6995 if you use the right triangle: 3.5 x tan (15) = .9378 why??? WHY??? shouldn't they be the same???

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