An electric ceiling fan is rotating about a fixed axis with an initial angular v

Question

An electric ceiling fan is rotating about a fixed axis with an initial angular velocity magnitude of 0.300 . The magnitude of the angular acceleration is 0.882 . Both the the angular velocity and angular acceleration are directed clockwise. The electric ceiling fan blades form a circle of diameter 0.760 . What is the magnitude of the resultant acceleration of a point on the tip of the blade at time = 0.196 ? I already figured out that it makes .473 rev/s, turned 7.5x10^-2 revs in 0.196 and has tangenital speed of 1.13 m/s. I got 3.36 as my answer but is says i neglected the tangential acceleration of the fan blade. Help please

Explanation / Answer

acceleration is sqrt((a(tangetial))^2+a(centripetal)^2)=
a(tangetial)=(ang acceleration)*2*pi*(diameter/2)
a(centripetal)=(diameter/2)*((ang velocity)*2*pi)^2
resultant acceleration is

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