therock005 Posted September 3, 2010 Posted September 3, 2010 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. Quote
lpseifert Posted September 3, 2010 Posted September 3, 2010 i. yes ii. yes b. yes http://mathforum.org/dr/math/faq/formulas/faq.trig.html all 3 are easy to do graphically with cad Quote
therock005 Posted September 3, 2010 Author Posted September 3, 2010 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. Quote
BIGAL Posted September 7, 2010 Posted September 7, 2010 What are you trying to do ? You may not need the formula's. Autocad has programable functions regarding square to. Quote
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