iCoachMath
STEM Excellence Series: Empowering the Next Generation
DECAHEDRON
Decahedron
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Definition Of Decahedron
A polygon with 12 sides and 12 angles is called a Dodecagon.
More About Decahedron
Each angle in a regular dodecagon is equal to 150°.
A dodecagon with all its 12 sides and 12 angles equal is called a regular dodecagon.
Example of Decahedron
The figure shown above has 12 sides and 12 angles, so it is dodecagon.
Video Examples: iCoachMath.com
Solved Example on Decahedron
Ques: Count the number of sides of the polygon.
Choices:
A. 12
B. 10
C. 9
D. 11
Correct Answer: A
Solution:
Step 1: This polygon has 12 sides and is called as dodecagon.
Quick Summary
- A dodecagon has 12 sides.
- A dodecagon has 12 angles.
- A regular dodecagon has 12 equal sides and 12 equal angles.
- Each angle in a regular dodecagon is equal to 150°.
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🍎 Teacher Insights
Use real-world examples to help students visualize dodecagons, such as some snowflakes that approximate this shape.🎓 Prerequisites
- Basic shapes
- Counting sides
- Angles
Check Your Knowledge
Q1: How many sides does a dodecagon have?
Q2: What is a dodecagon with all sides and angles equal called?
Frequently Asked Questions
Q: What is the difference between a decagon and a dodecagon?
A: A decagon has 10 sides, while a dodecagon has 12 sides.
Q: What are the properties of a regular dodecagon?
A: A regular dodecagon has 12 equal sides and 12 equal angles, each measuring 150 degrees.