Let the diameter of the blue semi circle be a.
Calculating a.
It implies;
(½*a*6)+(½*10*16) = 140
6a+160 = 2*140
6a = 280-160
6a = 120
a = 20 cm.
Again, a is the diameter of the blue semi circle.
b = ½(a)
b = 10 cm.
b is is the radius of the blue semi circle.
Area Blue Semi Circle is;
½*10*10π
= 50π cm²
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