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Question-5529




Question Number 5529 by Rasheed Soomro last updated on 18/May/16
Commented by Rasheed Soomro last updated on 18/May/16
△ABC is an equilaterl triangle.  D,E,F are mid-points of the sides.  The centres of arcs are vertices of  △ABC.  (a)AB=x ,  GH=?  (b) △ABC is equilateral,prove that  △GHI is also equilateral.
$$\bigtriangleup\mathrm{ABC}\:\mathrm{is}\:\mathrm{an}\:\mathrm{equilaterl}\:\mathrm{triangle}. \\ $$$$\mathrm{D},\mathrm{E},\mathrm{F}\:\mathrm{are}\:\mathrm{mid}-\mathrm{points}\:\mathrm{of}\:\mathrm{the}\:\mathrm{sides}. \\ $$$$\mathrm{The}\:\mathrm{centres}\:\mathrm{of}\:\mathrm{arcs}\:\mathrm{are}\:\mathrm{vertices}\:\mathrm{of} \\ $$$$\bigtriangleup\mathrm{ABC}. \\ $$$$\left({a}\right)\mathrm{AB}=\mathrm{x}\:,\:\:\mathrm{GH}=? \\ $$$$\left({b}\right)\:\bigtriangleup\mathrm{ABC}\:\mathrm{is}\:\mathrm{equilateral},\mathrm{prove}\:\mathrm{that} \\ $$$$\bigtriangleup\mathrm{GHI}\:\mathrm{is}\:\mathrm{also}\:\mathrm{equilateral}. \\ $$$$\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\: \\ $$

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