exam Maths Puzzle Numerical Ability

Explain the differancebetween the two descriptions of the principal square root of A^2 given on page.613

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exam Other Question

1). A powerful, unvanquished, excellent black snake that is 80 angulas in length enters into a hole at the rate of 7.5 angulas in 5/14 of a day; in the course of 1/4 of a day, its One leg of a right triangle is 2 inches smaller than the hypotenuse. The other leg is 5 inches long. What are the length of the unknown leg and hypotenuse?