The hypotenuse of an isosceles right triangle is $4\sqrt{2}$ units. How many square units are in the area of the triangle?
let the legs be x units long
Use pythagoras's theorum to solve for x.
Then you can find the area.
If we had a square with a diagonal = 4√2 units.....the side of the square = 4 units
Then the area of the square = side^2 = 4^2 = 16 units^2
So.....the area of this isosceles triangle will be 1/2 of this
Chris you have answered over me for no good reason AND you left out the bit that would cause the most problem.
"Why is the length of the square 4 units and what has a triangle got to do with a square."
If this kid sees your answer and wants to learn from it at all, which is quite unlikely, those are the questions they would be asking themselves.
I do admit my answer was very basic but it at least gave a hint on how to find the length of the triangle legs.
If the child wanted more help he/she should have, and probably would have asked.