book Maths Puzzle Numerical Ability

Hi,
Could someone please answer this for me
Tell whether a triangle with side of the given lengths 15,15,21.2
is 45,-45,-90 degrees 30,-60,-90 degrees or neither
I gave 45,-45,-90 and the answer was marked wrong.
Thanks

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book Other Question

1. Find the projection of the vector v1= (0,1,1) onto the line defined by the vector v2= (1,1,0)

2i) Find an orthogonal basis of the subspaces span (v1,v2), where v1 and v2 are I just can't figure out what they are asking .Its very hard
1.sqrt x^2 =x an identity (true for all values of x)?

2.A.
x-sqrt x=0 Solve for all values of x that satisfies the