book Maths Puzzle Numerical Ability

Find the value of Arc sin (cos pi/4).

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What are the two acute angles of a right triangle with legs 15 7/8 and 20 1/4 and hypotenuse 25 3/4? Sorry I put in wrong e-mail prev. I need help finding the radius and center of a circle with the following equation x squared+ y squared + 4x + 10y + 15 = 0 thanks!