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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Answers by country

Tales' sails
Pythagorean sickles
Archimedes' arches
lune of Hippocrates,
answers
flagthe Netherlands
33%
8%
8%
50%
12
flagAustralia
5%
5%
42%
47%
19
flagIndia
12%
24%
21%
36%
33
flagthe United Kingdom
32%
16%
16%
32%
37
flagthe United States
23%
28%
17%
30%
52
flagPoland
29%
20%
20%
29%
1908
flagSwitzerland
14%
35%
21%
28%
14
flagGermany
31%
23%
22%
22%
117
flagAustria
28%
31%
31%
9%
32
flagGreece
16%
8%
66%
8%
12