The illustration shows the figure known in mathematics as;

Tales' sails
Pythagorean sickles
Archimedes' arches
lune of Hippocrates,
In geometry, the lune of Hippocrates, named after Hippocrates of Chios, is a lune bounded by arcs of two circles, the smaller of which has as its diameter a chord spanning a right angle on the larger circle. Equivalently, it is a non-convex plane region bounded by one 180-degree circular arc and one 90-degree circular arc. It is the first curved figure to have its exact area calculated mathematically.
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Tales' sails
Pythagorean sickles
Archimedes' arches
lune of Hippocrates,
answers
flagthe Netherlands
27%
9%
9%
54%
11
flagAustralia
5%
5%
38%
50%
18
flagIndia
12%
24%
21%
36%
33
flagthe United Kingdom
25%
21%
17%
32%
28
flagPoland
28%
20%
19%
30%
1717
flagGermany
30%
23%
20%
25%
82
flagthe United States
35%
35%
20%
8%
34
flagAustria
33%
29%
29%
8%
24
flagGreece
16%
8%
66%
8%
12