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Construct-a-line-segment-of-a-2-units-using-ruler-and-compass-only-when-a-line-segment-of-a-units-is-given-




Question Number 3607 by Rasheed Soomro last updated on 16/Dec/15
Construct a line segment of a^2  units   using ruler and  compass only, when  a line segment of a units is given.
Constructalinesegmentof\boldsymbola2unitsusingrulerandcompassonly,whenalinesegmentof\boldsymbolaunitsisgiven.
Answered by prakash jain last updated on 16/Dec/15
Let us say line segment is AB.  Draw a (BC) ⊥^r  to AB at B of length 1 unit let  us point is C.  ABC is right angled triangle with ∠B=90°  tan C=((AB)/(BC))=a  At point B draw a circle of radius AB.  Extend BC let us it cuts the circle at D.  BD=a.  Draw a line l parallel to line AC passing thru  B.   Draw ⊥^r  to line BD at D. let us say  it cuts line l at E.  Since l(BE) ∥ to line AC and CBD is a straight  line.  ∠ACB=∠EBD=x  tanx=a=((AB)/(BC))=((DE)/(BD))  BD=a⇒DE=a^2
LetussaylinesegmentisAB.Drawa(BC)rtoABatBoflength1unitletuspointisC.ABCisrightangledtrianglewithB=90°tanC=ABBC=aAtpointBdrawacircleofradiusAB.ExtendBCletusitcutsthecircleatD.BD=a.DrawalinelparalleltolineACpassingthruB.DrawrtolineBDatD.letussayitcutslinelatE.Sincel(BE)tolineACandCBDisastraightline.ACB=EBD=xtanx=a=ABBC=DEBDBD=aDE=a2
Commented by Rasheed Soomro last updated on 16/Dec/15
eXCELlent Sir!
eXCELlentSir!\boldsymboleXCELlent\boldsymbolSir!

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