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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book Other Question

32% boys are ina history class.There are 30 students in all.How many girls are in the class? The equation |x-1|+|x-2|+|x-3|=4 has two solutions what are they?