Understanding Decagons

This video from MooMooMath and Science introduces the decagon, a 10-sided polygon. It reviews the properties of polygons, including straight lines and closed shapes, and explains the characteristics of regular decagons with equal sides and angles. The video covers the calculation of interior angles, diagonals, central angles, and area of a decagon. It also discusses irregular decagons, which do not have equal sides or angles, and provides examples. The video concludes with a reminder to subscribe for daily math and science content.

What is a key characteristic of a polygon?

• It has straight lines and is closed.

• It is an open shape.

• It is always a circle.

• It has curved lines.

How many equal sides does a regular decagon have?

• 10

• 8

• 12

• 5

What is the sum of all interior angles of a decagon?

• 1620 degrees

• 1260 degrees

• 1440 degrees

• 1080 degrees

How many diagonals can be found in a decagon?

• 35

• 20

• 25

• 30

What is the measure of the central angle of a regular decagon?

• 30 degrees

• 36 degrees

• 40 degrees

• 45 degrees

How can you calculate the area of a decagon if you know the apothem?

• Add the perimeter and the apothem.

• Multiply the perimeter by the apothem.

• Divide the perimeter by the apothem.

• Multiply half the perimeter by the apothem.

What defines an irregular decagon?

• It is a circle.

• It has equal sides and angles.

• It has unequal sides and angles.

• It has curved lines.