Given numbers a, b and c, find the height of the right angled triangle with sides a and b and hypotenuse c, for the base c. If a right angled triangle with sides a and b and hypotenuse c does not exist, return NaN (not-a-number).
Magic is simple (for beginners)
Reverse the elements of an array
Sum the numbers on the main diagonal
Find Out sum of principal diagonal element of given matrix
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