Basic Polygon 1

How many sides does an octagon has?

• 6

• 7

• 8

• 9

How many sides does a Quadrilateral have?

• 4
• 3
• 6
• 9

 What is the name of this polygon?

• a pentagon
• a quadrilateral
• an octagon
• a triangle

What is the name of a shape with 5 sides, 5 vertices?

• hexagon
• octagon
• pentagon
• triangle

How many vertices does a Triangle have?

• 4

• 3

• 2

• 6

How many diagonals does the polygon have?

• 3

• 4

• 5

• 6

Which shape is not a polygon?

• A

• B

• C

• D

Find the number of vertices and the number of diagonals of a polygon with 9 sides.

• Vertices: 9 , Diagonals: 27

• Vertices: 6 , Diagonals: 34

• Vertices: 9 , Diagonals: 12

• Vertices:8 , Diagonals: 56

What is the formula of finding the number of diagonals in a polygon?

• $\frac{n\left(n-1\right)}{2}$

• $\frac{n\left(n-2\right)}{2}$

• $\frac{n\left(n-3\right)}{2}$

• $\frac{n\left(n-4\right)}{2}$

How many diagonals are there in a polygon that has 20 sides?

• 100

• 170

• 200

• 270