The cross section of a square pyramid taken perpendicular to the base that passes through the top vertex produces which two-dimensional shape?

note: use all lowercase letters in your answer to receive credit.

triangle.  

Step-by-step explanation:

given: a square pyramid

to find : shape of cross section made when a plane perpendicular

             to base and passes through top vertex.                                                                  

when a plane cuts the square pyramid perpendicular to base and passes through top vertex we get a cross section made by its two equal slant height and side of the square.

therefore, we get a triangle or more specifically isosceles triangle.

picture is attached.