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A regular dodecagon $P_1 P_2 P_3 \dotsb P_{12}$ is inscribed in a circle with radius $1.$ Compute
\[(P_1 P_2)^2 + (P_1 P_3)^2 + \dots + (P_{11} P_{12})^2.\](The sum includes all terms of the form $(P_i P_j)^2,$ where $1 \le i < j \le 12.$)

 Mar 22, 2020
edited by Guest  Mar 22, 2020
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This is unreadable. Please repost your question with proper formatting so it's readable

 Mar 22, 2020

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