Let b = 2 units.
sin50 = c/2
c = 1.5320888862 units.
cos50 = d/2
d = 1.2855752194 units.
e = 180-50
e = 130°
f = 180-130-40
f = 10°
Calculating r.
(1.2855752194/sin10) = (r/sin40)
r = 4.7587704832 units.
Therefore;
r÷b is;
= 4.7587704832÷2
= 2.3793852416
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