Let the radius of the circle be a.
a² = 2²+4²
a² = 20
a = 2√(5) cm.
Area Blue is;
Area half circle with radius 2√(5) cm - Area red rectangle with length and base 6 cm and 2 cm respectively.
= ½(2√(5))²π - (6*2)
= 10π-12
= 2(5π-6) cm²
= 19.4159265359 cm²
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