The tip of a 12-inch wiper blade wipes a path that is 30 inches long. what is the angle of rotation of the blade in radians to the nearest tenth? 0.4 radians 1.3 radians 2.5 radians 5.0 radians

Circumference of a circle is given by:
C=theta/360 πd
given that:
d=24 inches
C=30 inches
therefore;
30=Θ/360*π*24
thus;
30=0.21Θ
thus;
Θ=143.24
converting this into radians we proceed as follows;
radians=(π/180)*degrees
=(π/180)*143.24
=2.5 radians

The answer is 2.5 radians

Idon’t understand this but 90