Image need to be scale to 80% for the image to be less than 35mm

its very big question plz make it small

yeah i know the problem you need. i am taking it right now. the answer is step 3

~mickey

arc length = radius * x ( in radians)

6 * pi = 18 * x

divide by 18 on each side

6 pi / 18 = x

pi/3 = x

the angle is pi / 3 radians

or   60 degrees