Are (1/2 x 3) x 8 and 3 x (1/2 x 8) equal?

Explain how this can help in finding the area of a triangle

yes they are equal.

they can help in finding the area of a triangle because it shows that it doesn't matter if you half the base or the height and multiply them with eachother to get a triangle
Triangle = 1/2 * base * height
what this is saying is that whether you do
(1/2 x base) x height OR (1/2 x height) x base the answer will be the same