how to find the angle of a triangle with points (-4,1,-4), (-5,-4,0), (5,-4,-3)?

Top 2 Answers

A few days ago

Favorite Answer

You could use the cosine rule:

a2 = b2 + c2 – 2bc cos A

here A is the angle subtended by the sides b and c. a is the length of the side opposite to the angle A

the length can be caculated using:

sqrt(a1^2 + a2^2+a3^2), with a_vect= (a1,a2,a3)

—

you could also just use the dot product:

v1•v2 = |v1||v2| cos(angle)

A few days ago

Ugly Betty

The site I listed may help, also first graph it, that will help visually.

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