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Posted

I've got to brush up on my trigonometry skills, and so i want to ask a couple fo trig related questions.

 

A)Given you know the lengths of all three sides of a (non-right) triangle...

 

i)Do you know all the angles as well?

ii)Can you calculate the length of the perpendiculars as well?

 

B)If you know 2 sides of a triangle (non-right in particular) and one perpendicular... can you calculate length for the final side?

 

These are a couple of things that boggled me for starters, since I'm inspecting a drawing, and something does not seem right to me, so having answers to these questions will help me proceed.

Posted

i)So for example based on those formulae, angle A is calculated as A=arccos(a^2-b^2-c^2/-2bc)?

 

ii)And in order to calculate the perpendiculars you have to first calculate all of these angles, correct?

 

b)I guess this one was easy. A perpendicular splits an oblique triangle into 2 right ones. So given you know 2 sides and the perpendicular you can always use the pythagorem to solve for the unknown angle.

Posted

What are you trying to do ? You may not need the formula's. Autocad has programable functions regarding square to.

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