Area of the isosceles triangle is;
The radius of the semi circle is 10 units.
Therefore the single side length of the square is;
2 * 10 = 20 units.
Therefore red area is;
Area triangle with two side length 20 units each, and angle (90-2atan½)°
= ½(20²)sin(90-2atan½)
= ½(240)
= 120 square units.
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