θ = π/3 , π, 5π/3 when θ = π/3, r = 3/2 when θ = π, r = 0 when θ = 5π/3 , r = 3/2 (3/2, π/3) and (3/2, 5π/3) give horizontal tangent lines </span>--------------------------------------------------------------------------------- For horizontal tangent line, dx/dθ = 0
The best and most correct answer among the choices provided by your question is the second choice or letter B.
<span>Segment TX is the segment that would best represent the altitude of the parallelogram.</span>
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