The shape of cross section is trapezoid.
What is rectangular pyramid?
A rectangular pyramid is a pyramid, where four triangular sides correspond to each side of rectangular base.
What is vertex of a pyramid?
A vertex is a point where edges of a pyramid meet or intersect.
What is cross section?
A cross-section is a shape which is obtained by the intersection of any solid object by a plane.
For given situation consider a rectangular pyramid ABCDE,
If pyramid is sliced so the cross section is perpendicular to its base but does not pass through its vertex, then from figure the cross section will be PQRS.
The cross section PQRS is perpendicular to the base BCDE.
This means, the shape of the cross section PQRS is trapezoid.
Hence, the shape of cross section is trapezoid.
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