a² = 2²+4²
a = √(20) cm.
a is radius OA = OB.
tanb = 4/2
b = atan(2)°
c = atan(½)°
d = 180-b-c
d = 180-atan(2)-atan(½)
d = 90°
d is the angle subtended by chord AB and the radius (OA and OB) of the sector.
Area yellow is;
(90π*√(20)²/360)-(½*√(20)²*sin90)
= 5π-10
= 5(π-2) cm²
= 5.7079632679 cm²
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