All of internal angles in miraculous pentagram are...

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Pentagramma mirificum (Latin for miraculous pentagram) is a star polygon on a sphere, composed of five great circle arcs, whose all internal angles are right angles. This shape was described by John Napier in his 1614 book along with rules that link the values of trigonometric functions of five parts of a right spherical triangle (two angles and three sides). The properties of pentagramma mirificum were studied, among others, by Carl Friedrich Gauss.
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flagGreece
52%
17%
23%
5%
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flagIndia
41%
25%
15%
17%
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flagPoland
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22%
13%
24%
993
flagAustralia
36%
18%
4%
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flagthe United States
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28%
17%
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flagthe United Kingdom
15%
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12%
48%
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flagGermany
9%
36%
9%
36%
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