Radius of the inscribed quarter circle is 36 cm.
Radius of the inscribed semi circle is;
½(½(36))=9 cm.
Radius of the small inscribed circle is;
⅓(⅓(36))=4 cm.
Therefore the side lengths of triangle blue will be;
(36+9)=45 cm.
(36+4)=40 cm.
(9+4)=13 cm.
Therefore area triangle blue is;
0.5x45x40sin(cos–¹((45²+40²-13²)÷(2x45x40)))
= 252 cm²
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