Help with this question, please

A3-dimensional figure has a square base and 4 lateral faces that meet at a point. explain the difference between the cross sections when a slice is made perpendicular to the base through the vertex, and when a slice is made perpendicular to the base and not through the vertex

Write an inequality for this description. - one fourth of the opposite of the difference of five and a number is less than twenty.

Opposite angles in a parrellelogram are