Calculating yellow area.
It is;
2(area quarter circle with radius 4 units - area triangle with base and height 4 units respectively - area quarter circle with radius 3 units + area triangle with base and height 3 units respectively).
= 2(¼(4*4)π-½(4*4)-¼(3*3)π+½(3*3))
= 2(4π-8-¼(9π)+½(9))
= 2(¼(7π)-½(7))
= 2(¼(7π-14))
= ½(7π-14) square units.
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