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Posted on April 23, 2022 (Updated on July 29, 2025)

What is the area of a regular hexagon inscribed in a circle?

Space & Navigation

Hexagons and Circles: A Sweet Geometric Connection

Hexagons! Those six-sided shapes are more than just something you see in honeycombs. Regular hexagons, with their equal sides and angles, pop up all over the place, and they’ve got some seriously cool geometric properties. One of my favorite problems? Figuring out the area of a hexagon when it’s snuggled perfectly inside a circle. Sounds tricky, right? Actually, it’s surprisingly simple once you see how everything connects.

The Secret: Equilateral Triangles

Here’s the key: imagine a regular hexagon sitting inside a circle, all its corners just touching the edge. Now, picture lines going from the very center of the circle to each corner of the hexagon. What you’ve just created are six identical equilateral triangles! Seriously, they’re all exactly the same. Why equilateral? Well, each angle at the center is 360 degrees divided by 6, which is 60 degrees. And because the other two sides of each triangle are radii (plural of radius) of the circle, those sides are equal, making it an equilateral triangle. Pretty neat, huh?

Cracking the Formula

Let’s say the radius of our circle is “r.” Since those triangles are equilateral, that means each side of the triangle is also “r.” Now, the area of one of those equilateral triangles is (√3 / 4) * r². Remember that formula from geometry class? If not, no worries, just trust me on this one!

Because our hexagon is just six of these triangles stuck together, we can find the total area by multiplying:

Area of hexagon = 6 * (√3 / 4) * r² = (3√3 / 2) * r²

Boom! That’s it. The area of a regular hexagon inside a circle is (3√3 / 2) * r². Simple as that.

Let’s Do Some Math!

Okay, let’s make this real. Imagine you’ve got a circular garden with a radius of, say, 7 meters. You want to build a hexagonal patio inside it. How much space will that patio cover? Just plug 7 meters into our formula:

Area = (3√3 / 2) * (7 m)² = (3√3 / 2) * 49 m² ≈ 127.31 m²

So, your hexagonal patio will cover about 127.31 square meters. Not bad!

Different Angles, Same Area

Just a quick note: you might see other formulas for the area of a hexagon, especially one that uses the side length “s.” But remember, for a hexagon tucked inside a circle, the side length “s” is the same as the radius “r.” So, the formulas are really saying the same thing.

More Than Just Math

What I find fascinating is how much symmetry these shapes have. A hexagon has six lines of symmetry – you can fold it in half six different ways and it’ll match up perfectly. It also looks the same if you rotate it by 60 degrees. That symmetry, and the way hexagons fit together so well, is why you see them in everything from honeycombs to tile patterns. Understanding this simple geometric relationship opens up a whole world of cool applications. It’s not just about the formula; it’s about seeing the beauty and order in the world around us.

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