| When I looked at what she was doing, she was trying to work out how to calculate the sum of the internal angles of a pentagon. |
| North of Orion lies a pentagon of stars which mark the constellation Auriga, the brightest of which is Capella. |
| How much more sacred than our triangle would be a square, a pentagon, a decagon, a figure with a hundred sides? |
| He calculates the side of a regular pentagon in terms of the radius of the circumscribed circle. |
| Although it is impossible to inscribe a regular pentagon in a square, an equilateral pentagon can be inscribed in two ways. |
| Apparently he got his communication from the pentagon about the time I got mine. |
