book Maths Puzzle Numerical Ability

A right triangle has one leg that is 7 centimeters. The hypotenuse is 25 centimeters. Find the length of the other leg.

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book Other Question

could someone explain to me how to find the perimeter of a square that has a side measure of 45 cm.Do I multiply 45 x 4? Thanks solve each proportion.

2/7 = x/-42
5/12 = (x+1)/4
(n+8)/-5=(n-3)/-1
(5-w)/(3+w)=13/12

any idea on these?
im absolutely clueless...