Math Problem (Level 2) : Solid made by cutting quadrangular pyramid (KK13)

The figure is a development view of the solid which was made of cutting a certain quadrangular pyramid by the plane parallel to the bottom.

(1) Find the height of the original quadrangular pyramid.

(2) Find for the volume of this solid.

Answer

(1) 9 cm
(2) 38 cm³

Reference