Octagon Facts

The video tutorial explains the properties of octagons, including their sides, angles, and diagonals. It distinguishes between regular and irregular octagons, highlighting that regular octagons have equal sides and angles, while irregular ones do not. The tutorial also covers convex and concave octagons, explaining that convex octagons have no internal angles greater than 180 degrees. Finally, it provides a method for calculating the perimeter of a regular octagon using the formula 8A, where A is the length of one side.

What is the origin of the word 'Octagon'?

• It comes from the Latin word for eight.

• It is named after a famous mathematician.

• It is a combination of the words 'octopus' and 'polygon'.

• It is derived from the Greek words for eight and sides.

How many diagonals does an octagon have?

• 8

• 12

• 20

• 24

What is true about the angles in a regular octagon?

• All angles are 150 degrees.

• All angles are 180 degrees.

• All angles are 135 degrees.

• All angles are 90 degrees.

What is the sum of the interior angles of an irregular octagon?

• 1260 degrees

• 1080 degrees

• 720 degrees

• 900 degrees

How do you calculate the perimeter of a regular octagon?

• Multiply the length of one side by 8.

• Multiply the length of one side by 10.

• Multiply the length of one side by 6.

• Multiply the length of one side by 4.