Question 138261
Use the Pythagorean Theorem to find the length of the other leg {{{a^2+b^2=c^2}}}, so {{{a^2=c^2-b^2}}}.  Once you know the length of the other leg, the perimeter is the sum of the three sides.  Since it is a right triangle, the base is one leg and the height is the other, so use {{{A=(bh)/2}}} to calculate the area.