SOLUTION: Hi. I have tried this problem over and over, and came up with this solution: (2√2A + 2√A), which the computer claims is wrong. Thank you for your assistance. (a) A

Algebra ->  Surface-area -> SOLUTION: Hi. I have tried this problem over and over, and came up with this solution: (2√2A + 2√A), which the computer claims is wrong. Thank you for your assistance. (a) A       Log On


   

Question 702666: Hi. I have tried this problem over and over, and came up with this solution:
(2√2A + 2√A), which the computer claims is wrong. Thank you for your assistance.
(a) A right-angled triangle has a 45 degree angle. If the area is A cm^2 what is the length of the perimeter?
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
Isosceles! If right triangle has a 45 degree angle, then the other angle not 90 degrees is also 45 degrees. Two sides are equal, too. This triangle is half a square.

Let s be length of the legs and let h be the hypotenuse.

Area, A=(1/2)s^2, meaning s=sqrt%282%2AA%29

The two length s meet at the right-angle.
h%5E2=s%5E2%2Bs%5E2, ... and you do the steps,... h=s%2Asqrt%282%29

Perimeter is the sum of the lengths that make the triangle.
Perimeter is s%2Bs%2Bh
perimeter=2%2Asqrt%282%2AA%29%2Bs%2Asqrt%282%29