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particle in R2 travels along a circle centered at (h,k) with radius a > 0. Parametrize...

particle in R2 travels along a circle centered at (h,k) with radius a > 0. Parametrize this circular path r(t) as a function of the parameter variable t. Please prove that at all t values, the tangent vector r0(t) is orthogonal to the vector r(t)−<h,k>

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