a² = 10²+10²-2*10*10cos150
a = 19.31851652578 cm.
Where a is AF which is equal AE.
(19.31851652578/sin150) = (10/sinb)
b = 15°
Where b is angle BAF.
tan15 = c/10
c = 2.67949192431 cm.
It implies;
Area Green Region is;
Area square with side 10 cm - 2(area triangle with height 2.67949192431 cm and base 10 cm.
= 10² - ½*2(10*2.67949192431)
= 100-26.7949192431
= 73.2050807569 cm²
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