Question

State and prove Lami's theorem.

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Solution

α+β+θ=360 from fig (a) Now consider figure (b) (180−α)+(180−β)+(180−θ)=180 (SUM of angles of a triangle So open brackets 180+180+180-(α+β+θ)=180 which gives α+β+θ=360 which is true from figure (a) hence PQR should be 180-β Thats all Thank you Do like us

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