# Thread: finding angles using bearings

1. ## finding angles using bearings

A man starts walking from point A at a bearing of 56°. He walks for 400m and stops at point B. He then walks a bearing of 300° for 200m and stops at point C. From there he returns to point A.

Could I have some help finding the interior angles of this triangle, using theorems or trig or something, I am completely lost...

2. Originally Posted by boonies
A man starts walking from point A at a bearing of 56°. He walks for 400m and stops at point B. He then walks a bearing of 300° for 200m and stops at point C. From there he returns to point A.

Could I have some help finding the interior angles of this triangle, using theorems or trig or something, I am completely lost...
1. Make a sketch.

2. The greyed angle must be 56°. Then you can calculate the red angle.

3. Now use Cosine rule to calculate $\displaystyle \overline{AC}$

4. Now you can use either Sine rule or Cosine rule to calculate the missing angles.

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# internal angles of triangle from bearings

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