I have a upcoming test today and I'm not quite sure how to solve this question. If anyone could provide some help that would be fantastic. Thank you.
The missing dimension is one side of the base triangle. base triangle is a right triangle with one side 4units and hypotenuse 5 units, so the third side is 3 units. Pythagorean triplets.
Now volume of the pyramid = 1/3 x area of base x height.
1/3 x ( 1/2 x 3 x 4 ) x 6= 1/3 x 6 x 6=12 cu units