book Maths Puzzle Numerical Ability

If i only know the length of the chord then is it possible to find out the radius of the circle?

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The problem is 3 cube root x^3y^13 + 4xy cube root 8y^10. It states simplify the radical expression and assume that all variables represet positive real numbers. I have come up wit Please help!

A ranger in fire tower A spots a fire at a direction of 295 degrees. A ranger in fire tower B, located 45 miles at a direction of 45 degrees from tower A, spots the