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

How do i find the nth rule when a3=15 and a11=5 (the 3 & 11 are subscripts) How do you find the equation of a line from a few points?

Q: Find the equations of both lines.

The solutions of line m are (3,3), (5,5), (15,15), (34,34), (678,678), and (12