Find radius of circular motion from acceleration vectors at two times

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Homework Statement


At t1 = 1 s, the acceleration of a particle moving at constant speed in counterclockwise circular motion is http://edugen.wiley.com/edugen/shared/assignment/test/session.quest365780entrance1_N10039.mml?size=14&algorithm=1&rnd=1201725654088
At t2 = 3 s (less than one period later), the acceleration is http://edugen.wiley.com/edugen/shared/assignment/test/session.quest365780entrance1_N10080.mml?size=14&algorithm=1&rnd=1201726050259
The period is more than 2 s. What is the radius of the circle?

Homework Equations


a=v^2/r


The Attempt at a Solution


I figured out the period is 2.67 seconds and the acceleration is 7.21 m/s^2. Then I get stuck
 
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Also, if those links don't work, reply and ill try my best to fix them