Total red area is;
3(area square with side 5 units - area quarter circle with radius 5 units) + Area triangle with height 5 units and base 10 units - Area sector with radius 5 units and angle 2atan(½)° - Area triangle with two side 5 units each, and angle (180-2atan(½))°.
= 3(25-¼(25π)+½(50)-(2atan½÷360*25π)-½(25)sin(180-2atan½)
= 75-18.75π+25-11.591190225-10
= 19.5039475202 square units.
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