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  Mathematics: How long is C side in triangle
   
   
 
 
 
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1st Aug 2012, 5:53 AM
Hi.

Write the formula and explanation of calculating the C side of triangle below in picture?


changed: mat (2.8.2012 ob 03.59.45)
 
 
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15th Aug 2012, 2:49 AM
The angle opposite to the c side is called γ (greek letter for gamma) and the formula to calculate the c side of a triangle is:

c² = a² + b² - 2ab cos(γ)

c = sqrt (a² + b² - 2ab cos(γ))

c = sqrt (9² + 10² - 2*9*10 * cos(55))

c = sqrt (81 + 100 - 180 * 0.57)

c = sqrt (81 + 100 - 102.6)

c = sqrt (78.4)

c = 8.85 cm

I think it's right that way, you just picked some weird values.
 
 
 
   
   
 
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