Trigonometric rules (eg. sine, cosine)
Do the sine and cosine rules work for a right-angled triangle?
Original post by Sichwünschen
Do the sine and cosine rules work for a right-angled triangle?
Yes. The cos rule reduces to pythagoras and the sin rule is just the usual side ratios. Why not try and show this?
A common way to prove/derive the cos and sin rules is to drop a perpendicular or altitude and form right triangles. So if you have a right triangle in the first place, its just the usual relationships.
(edited 8 months ago)
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