The Pentagram
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The Pentagram (or Pentangle) is a 5-pointed star. You may think it has something to do with witchcraft, but in fact it is more famous as a magical symbol and is also a holy symbol in many religions. In fact, this simple figure is quite amazing. |
| Inside a Pentagram is a Pentagon |  |
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You can make a pentagram by first drawing a pentagon, then extending the edges. |  |
| Or by drawing lines from corner to corner inside a pentagon. |
Ratios
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But the pentagram has a special number hidden inside called the Golden Ratio, which equals approximately 1.618
When I drew this, I measured the 4 lengths and I got a=216, b=133, c=82, d=51. So let's check to see what the ratios are:
If I had drawn and measured more accurately, I would have been even closer! |
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Why not have a go yourself:
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Irregular PentagramSo far we have only been looking at the regular pentagram (all sides and angles equal), but there are also irregular pentagrams. |
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