exam Maths Puzzle Numerical Ability

I know the length of all 3 sides of a right triangle, how do I find the values for the other 2 angles of the triangle?

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exam Other Question

Jan is flying a plane on a triangular course at 320 mi/hr. she flies due east for two hours and then turns right through a 65o angle. How long after turning will she be exactly southeast of where she started?
Thank You Simplify:

5x^3(7x)^2