Solution: Let this container be about x meters high. Since the diameter of the bottom is equal to the height, the radius of the bottom is x/2m.

So 3. 14(x/2)(x/2)x=40.

3. 14*x^3/4=40

x^3=50.96

Get x≈3.7 meters.

This container is about 3.7 meters high.