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In figure xp/py=xq/qz=3if the area of …

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In figure xp/py=xq/qz=3if the area of triangle xyz is32cm, then find area of qadrilateral pyzq
  • 1 answers

Sia ? 6 years, 5 months ago

Given  {tex}\frac{{XP}}{{PY}} = \frac{{XQ}}{{QZ}}{/tex} 
{tex}\Rightarrow {/tex} PQ {tex}\parallel{/tex} YZ  .....(i) [By converse of B.P.T]
In {tex}\triangle {/tex} XPQ and {tex}\triangle {/tex} XYZ we have
[ {tex}\angle{/tex} XPQ = {tex}\angle{/tex} Y [From (i) corresponding angles]
{tex}\angle{/tex} X = {tex}\angle{/tex}​X [common]
{tex}\therefore {/tex} {tex}\triangle {/tex} XPQ {tex}\cong{/tex} {tex}\triangle {/tex}XYZ [By AA similarity]
{tex}\therefore {/tex} {tex}\frac{{ar\left( {\triangle XYZ} \right)}}{{ar\left( {\triangle XPQ} \right)}}=\frac{{X{Y^2}}}{{X{P^2}}}{/tex}
{tex}\frac { P Y } { X P } = \frac { 1 } { 3 }{/tex}
We have {tex}\Rightarrow \frac { P Y } { X P } + 1 = \frac { 1 } { 3 } + 1{/tex}
{tex}\Rightarrow \frac { P Y + X P } { X P } = \frac { 4 } { 3 }{/tex} 
​​{tex}\Rightarrow {/tex} {tex}\frac{{XY}}{{XP}} = \frac{4}{3}{/tex}
Substituting in (i), we get
{tex}\frac{{ar\left( {\triangle XYZ} \right)}}{{ar\left( {\triangle XPQ} \right)}} = {\left( {\frac{4}{3}} \right)^2} = \frac{{16}}{9}{/tex}
{tex}\Rightarrow {/tex}{tex}\frac{{32}}{{ar\left( {XPQ} \right)}} = \frac{{16}}{9}{/tex}
{tex}ar\left( {XPQ} \right) = \frac{{32 \times 9}}{{16}} = 18c{m^2}{/tex}

Area of quadrilateral PYZQ = 32 - 18 = 14 cm2

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