regular pentagon
- noun
- /ˈrɛɡjələr ˈpɛntəɡən/
- Specialized
:
pentágono regular
- To construct a regular pentagon, each side must be of equal length and each interior angle 108 degrees.
Examples
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A regular pentagon has five equal sides.
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The soccer ball's pattern includes several black regular pentagons among its shapes.
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A regular pentagon can be inscribed perfectly in a circle.
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The architect designed a regular pentagon for the new park.
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To construct a regular pentagon, each side must be of equal length and each interior angle measures 108 degrees.
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A regular pentagon has five equal sides and five equal angles, making it a symmetric shape.
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The soccer ball's design features several black regular pentagons interspersed with white hexagons.
How Many
7
3.3
- Specialized
- Specialized
454
1.0
1
3.2
Surface Forms
Morphology
The meaning is directly and transparently derived from combining 'pentagon' (a five-sided shape) with 'regular' (having equal sides/angles); a learner who knows both words can infer that a regular pentagon has equal sides and angles. This compositional, name-like pattern is common in mathematics and across languages, so it should be immediately understandable to a B1 learner.
Etymology
Regular pentagon comes from two simple words: pentagon (a five-sided shape) and regular (meaning all sides and angles are the same). That's why a regular pentagon means 'a pentagon with all sides equal and all angles equal', the even five-sided shape that can fit perfectly in a circle.