I feed to find the circumference

C ≈ 131.95

Step-by-step explanation:

C=2πr

C = 2π(21)

C = 131.95

131.88 inches

step-by-step explanation:

2πr = circumference

2(21)(3.14)

= 131.88

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 "