how to solve this? which i have to find the height.

Answer:
h = 3
Step-by-step explanation:
We can see a triangle with a base equal to (1/2)×6 or 3 with a hypotenuse of 3×sqrt(2). So we can use the Pythagorean theorem to solve for height h:
hyp^2 = b^2 + h^2
h^2 = hyp^2 - b^2
[tex] {h}^{2} = {(3 \sqrt{2}) }^{2} - { 3}^{2} = 9[/tex]
or h = 3