Answer : The variables used in the equations for centripetal acceleration are, radius and tangential speed.
Explanation :
Centripetal acceleration : It is defined as any object moving in a circular path will have some acceleration vector that pointed towards the center of the circle.
Formula used for centripetal acceleration is,
![a_c=(v^2)/(r)](https://img.qammunity.org/2020/formulas/physics/college/2on2dy1u2967p0hvybn5shiof4xeqe51xd.png)
where,
= centripetal acceleration
r = radius of path
v = velocity or speed of an object or tangential speed
In the equation of centripetal acceleration, the radius and tangential speed are the variables.