book Maths Puzzle Numerical Ability

can you give me the formula to work out the hypotenuse when I only know 1 length & the three angles of the triangle

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solve.

13 - x/2 = x - 1/2 The distance an object falls is directly proportional to the square of the time it has been falling. After 6 seconds it has fallen 1296 feet. how long will it take to fall 2304 feet?