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# Incredibly annoying M4 problem. (Vectors) Watch

1. So, that's the problem statement :
and that's the solution:

Attachment 521801521803
Now the annoying bit is, if you try to work out Vw using the Sine rule with the triangle S2BA, you will get the wrong answer. How the hell is this even possible?
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2. Zacken TeeEm any ideas?
3. (Original post by oShahpo)
So, that's the problem statement :
and that's the solution:

Attachment 521801521803
Now the annoying bit is, if you try to work out Vw using the Sine rule with the triangle S2BA, you will get the wrong answer. How the hell is this even possible?
Perhaps I'm being dense, but I fail to see why triangle ABC is isosceles.
4. (Original post by ghostwalker)
Perhaps I'm being dense, but I fail to see why triangle ABC is isosceles.
The other two right triangles are congruent. They have an equal side (Vship) and equal angles.
5. (Original post by oShahpo)
The other two right triangles are congruent. They have an equal side (Vship) and equal angles.
Must be extra dense - can you give me the set of vertices for each of the two congruent triangles.

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