If a is the radius of the axle, b the radius of each ball-
bearing, and c the radius of the hub, why does the number of
ball bearings n determine the ratio c/a? Find a formula for c/a
in terms of n. Which is larger cos(sin x) or sin(cos x) ? Does
this depend on x ? Find the exact values of some trig. ratios
from this rectangle in which a cyclic quadrilateral cuts off
four right angled triangles.