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could you draw a bit of figure?

i can't .. that is my problem, too..

|dw:1353425869624:dw|

|dw:1353426012864:dw|

so what i'm going to find is the theta??

Find the angle between side AB and its new position.
what does this mean?

i guess that's the angle you are going to find ... can you find it?

i need further solution/explanation

|dw:1353426445410:dw|

that is 90 degrees

i used cosine law

\( \theta \) will be half of \( \alpha \)

45 ?

the book's answer is 60 degrees.. but i find it 45 degrees.. how did it ended up with 60?

yep .. should be around like that if you did it properly!!

aawww. can you explain it ?

b^2 = a^2 + c^2 - 2ac cos theta
that is cosine law right?
and the answer is 90 degrees