According to the study unit, the commutative property means

a. the order in which you add the numbers doesn't affect the sum.
b. the way the numbers are grouped does affect the sum.
c. the order in which you add the numbers does affect the sum.
d. the way the numbers are grouped doesn't affect the sum.

a net is a diagram that shows a “flattened” view of a solid. in a net, each face and base is shown with all of its dimensions. a net can also serve as a pattern to build a three-dimensional solid.

a pyramid is a three-dimensional object with a base that is a polygon and triangular faces that meet at one vertex.

" the net of a triangular pyramid consists of four triangles. the base here we are given of the pyramid is a equilateral   triangle, and the lateral faces are also triangles "