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    I have posted the question and the answer. My question is - please can someone tell me how the author from madasmaths used similar triangles to find the length of PQ

    Thank you very much
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      The two yellow triangles are similar.
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        The ratio a:2a should be the same as for (a-x):|PQ|.
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          Or  \dfrac{2a}{a} = \dfrac{|\text{PQ}|}{a-x}.
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          (Original post by GPiph)
          Or  \dfrac{2a}{a} = \dfrac{|\text{PQ}|}{a-x}.
          thank you
         
         
         
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