Q&A #193

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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