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Triangles, Trig, Law of Cosines & Law of Sine - Education...a SelectSmart.com Flowchart
Education. Triangles, Trig, Law of Cosines & Law of Sine
By Math
Viewed 1027 times since July 2013.


This SelectSmart.com Education. flowchart, a free online decision tool is a creation of Math and for amusement purposes only. The implicit and explicit opinions expressed here are the author's. SelectSmart.com does not necessarily agree.


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use 30-60-90 or 45-45-90.

YES
Is it an special right triangle?

YES
Is it a right triangle?

NO
Do you have the measurement of two side lengths and an angle OR three side lengths?

NO
Use law of sine.

NO
YES

5,12,13
or
3,4,5
or
7,24,25

YES
Is it a pythagorean triple?


Use law of Cosines.


NO

Use the trig ratio of Tangent:
Tan(theta)=opp/adj

NO
Do you have the measurement of the length of the hypotenuse?




YES

Use the trig ratio of Cosine:
Cos(theta)=adj/hyp

YES
Do you have the the measurement of the length of the side adjacent to the angle provided?
(measurement of adjacent side?)




NO


Use the trig ratio of Sine:
Sin(theta)=opp/hyp