Question

What is the sum of the number of Faces, Vertices and Edges of a Square Pyramid?

• A. 20
• B. 18
• C. 15
• D. 16

Answer 1

The correct option is B 18

• In geometry, an edge is where two Faces meet in an object.
• The common endpoint of two or more rays or line segments is known as Vertex.
• In any geometric solid that is composed of flat surfaces, each flat surface is called a Face.
• 
  
  As we can see in the figure above, Square Pyramid has 8 Edges, 5 Vertices and 5 Faces.
  
  number of Edges = 8
  number of Vertices = 5
  number of Faces = 5 (4 triangular + 1 square)
  
  $\therefore$ number of Edges + number of Vertices + number of Faces
  =8+5+5
  =18