tana = (10/5)
a = atan(2)°
b = ½(180-a)
b = ½(180-atan(2))°
cosb = c/10
cos(½(180-atan(2))) = c/10
c = 5.2573111212 cm.
sinb = d/10
sin(½(180-atan(2))) = d/10
d = 8.5065080835 cm.
It implies, blue area (right-angled triangle area) is;
½(cd)
= 0.5*5.2573111212*8.5065080835
= 22.360679775 square units.
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