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

In the diagram above, if O is the centre of the circle, then y=

(A) 25 degrees
(B) 80 degrees
(C) 90 degrees
(D) 100 degrees
When graphing a linear inequality, how do you know if the inequality represents the area above the line?