a² = 4²+2²
a = √(20)
a = 2√(5) units.
a is the diameter of the circle.
b = ½(a)
b = √(5) units.
b is the radius of the circle.
tanc = 4/2
c = atan(2)°
d = 180-c
d = (180-atan(2))°
It implies, the required angle, ? is;
Let it be e.
Observing Sine Rule.
(4/sin(180-atan(2))) = (e/sin45)
e = 3.1622776602 units.
Again, e is the required length.
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