a = ½(PQ)
a = ½(4)
a = 2 units.
b = 90-60
b = 30°
c = 180-45-30
c = 105°
d = 180-105-60
d = 15°
It implies;
(2/sin105) = (e/sin15)
e = 0.5358983849 units.
Therefore, Red Painted Area is;
4(area triangle with height 2 units and base 0.5358983849sin60 units)
= 4(0.5*2*0.5358983849sin60)
= 1.8564064607 square units.
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