What shapes can be cross sections of the rectangular pyramid?

A slice parallel to the base will take the shape of a .
A slice perpendicular to the base and through the top vertex will take the shape of a .
A slice perpendicular to the base and not through the top vertex will take the shape of a .

A slice parallel to the base will take the shape of a .

A slice perpendicular to the base and through the top vertex will take the shape of a .

d

step-by-step explanation:

i used the pitagoras theoreme

step-by-step explanation:

points a and b are equidistant from the desired line, so the line you find by using them will go through point r.

using points other than a and b will give the desired line only if they are equidistant from r. if they are randomly located, the perpendicular line you create will not necessarily go through point r, hence will not be a solution to the problem.