Question

For the triangle shown, find the length AD.

Answer 1

Find BCD first: sinB/12 = sinBCD/12 ... or just notice it's isosceles, so BCD is 25 degrees.

That makes BCA 50 degrees. Now you can find angle A, and use the sine rule to find DA.

Answer 2

Or find angle BDC, since 25+25+BDC = 180. Then find angle A.

Answer 3

Alright. :) Thanks so much!

Answer 4

No prob :)