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Warning: Non-descriptive thread title

## Homework Statement

Which equation is valid only when the angular measure is expressed in radians?

a) α = Δθ / Δt

b) ω= Δω / Δt

c) ω^2 = ωo^2 + 2αθ

d) ω = Vt/r (here T is a subscript)

e) θ = 1/2αt^2 + ωαt

Answer is D but why??

Answer is D but why??

## Homework Equations

I know angles can be measured in either degrees or radians

## The Attempt at a Solution

angular velocity = ??? divided by radius

I guess I don't understand what Vt is