An arc with a length of 12 cm lies on a circle with a diameter of 9cm

what is the length of the arc in radians?

a. about 1.3 radians
b. about 1.9 radians
c. about 2.2 radians
d. about 2.7 radians

Circumference is given by:
C=Θ/360πd
C=12 cm
d=9cm
thus;
12=Θ/360*π*9
12=0.0785Θ
Θ=12/0.0785
Θ=152.789
thus the angle in radians will be:
radians=(π/180)*degrees
=π/180*152.789
=2.6667
=2.7 radians
the answer is D]

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