Aplane cuts a pyramid as shown in the diagram. what is the shape of the cross section?

a: a hexagon

b: a pentagon

c: a square

d: a triangle

Answer

The shape of the cross section is Hexagon.  

Option A is the correct answer.

Explanation

The given pyramid is pentagonal pyramid. The cross section of pentagonal pyramid is a pentagon.

But in the given figure a plane cuts a pyramid in a different way. After cutting the shape of the cross section will  have six sides.  

So it  will be a hexagon. All sides are not equal so it is not a regular  hexagon.

any of them that add up to 180 degrees.

i think the answer is a.( -3, -1 )