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**Maths409** Hi i'm stuck on 2 questions and wondering if you can help me out.

1 ) The area of a sector of a circle with radius r cm is fixed at 16 square centimetres, show that the perimeter P cm of the sector OPQ is given by

P = 2 (r + 16/r).

2 ) Express cos x + 2 sin x in the form k cos (x - a) where k > 0 and 0 < a < 360.

Hence solve the equation cos x + 2 sin x = 1, where 0 < x < 360

in question 2, i couldn't put in degrees signs, the a = alpha, and the "<"s used are the 'less or the same than' - i didn't know how to write them.

thanks for any help