book Maths Puzzle Numerical Ability

From the formula: Circle's Chord Length (L) = 2[h(2r-h)]^0.5 where r= radius of circle and h= chord's height. I have tried to rearrange the equation to solve for h with no success

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when do you cross multiply fractions and when do you just multiply the numerators and denominators A quadrilateral has 3 sides of equal length and its perimeter is 19 cm. Find all the integral possibilities for the length of the sides in centimeters. Hint: The sum of the lengt