Radius of the green circle is 4 units, therefore area of the green circle is;
π4²
= 16π square units.
Calculating radius of the red circle.
Let the radius of the red circle be r.
(4-r)²+(5-r)²=(4+r)²
16-8r+r²+25-10r+r²=16+8r+r²
r²-26r+25=0
r²-25r-r+25=0
r(r-25)-1(r-25)=0
Therefore;
r≠25 units.
r=1 unit.
Therefore area red circle is;
π1²
= π square units.
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