Answer:
First calculate the third length of the triangle using the Pythagorean theorem on a right isosceles triangle given by:
hyp=side√2=4√2
Then we know that since this is an isosceles triangle, the altitude is also a median.
We can then use the property of the median relative to the hypotenuse is equal half of it.
median/Altitude=hyp/2=4√2/2=2√2