What Is A 7 Sided Shape Called?
Have you ever wondered what a 7-sided shape is called? Many people are familiar with the names of common shapes, such as squares, circles, and triangles, but may not know the name of a 7-sided shape. In this article, we will explore the name and properties of this lesser-known shape.
What is a 7-Sided Shape?
A 7-sided shape is a polygon with seven sides and seven angles. It is also known as a heptagon, which comes from the Greek words "hepta," meaning seven, and "gonia," meaning angle. The heptagon is a regular polygon, meaning that all of its sides and angles are equal.
Properties of a Heptagon
As mentioned, a heptagon is a regular polygon, so all of its sides and angles are equal. It has seven vertices, or corners, and seven diagonals, which are the line segments drawn between non-adjacent vertices. The sum of the interior angles of a heptagon is 900 degrees, and each interior angle measures approximately 128.6 degrees.
Heptagons can also be classified as convex or concave. A convex heptagon has all of its interior angles less than 180 degrees and all of its vertices pointing outward. A concave heptagon has at least one interior angle greater than 180 degrees and at least one vertex pointing inward.
Real World Examples of Heptagons
While heptagons may not be as common as other shapes, they can be found in a variety of places in the real world. For example, many stop signs are heptagons. The shape of the sign allows drivers to easily recognize it as a stop sign, even from a distance.
Another example of a heptagon is the shape of some coins. The British fifty pence coin, for instance, features a heptagonal shape with rounded edges.
Fun Facts About Heptagons
Here are some interesting tidbits about heptagons:
- The heptagon is the only polygon with a name that contains the number of sides it has.
- The heptagon is the smallest regular polygon that cannot be constructed using only a compass and straightedge.
- The heptagon has been used as a symbol in various cultures and religions, including Christianity and Islam.
Conclusion
So, what is a 7-sided shape called? The answer is a heptagon. This lesser-known shape may not be as common as some others, but it has its own unique properties and real-world examples. Whether you are a geometry enthusiast or simply curious about the world around you, the heptagon is an interesting shape worth exploring.
Remember, the next time you see a stop sign or a British fifty pence coin, you'll know that they are heptagons!
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