In Fig., BCDE is a square and a 3D shape has been formed by joining th

1.	In Fig., BCDE is a square and a 3D shape has been formed by joining the point A in space with the vertices B, C, D and E. Name the 3D shape and also its (i) vertices, (ii) edges and (iii) faces.
Answer» The 3D shape formed is a square pyramid. (i) Vertices are A, B, C, D and E. (ii) Edges are AB, AC, AD, AE, BC, CD, DE and EB. (iii) Faces are: square BCDE and triangles ABC, ACD, ADE and ABE.

In Fig., BCDE is a square and a 3D shape has been formed by joining the point A in space with the vertices B, C, D and E. Name the 3D shape and also its (i) vertices, (ii) edges and (iii) faces.

Answer»

The 3D shape formed is a square pyramid.

(i) Vertices are A, B, C, D and E.

(ii) Edges are AB, AC, AD, AE, BC, CD, DE and EB.

(iii) Faces are: square BCDE and triangles ABC, ACD, ADE and ABE.