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If the diagonal of a rectangle measures 65cm and its sides are in the ratio 12:5, find the sides of the rectangleI will mark him as the brainliest who answers first and correctly​

Answer»

Given:

  • Diagonal of a rectangle = 65 cm
  • Ratio of the sides of a rectangle is 12:5.

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To FIND:

  • Sides of the rectangle?

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Solution:

☯ Let ABCD be the rectangle and AC be the Diagonal.

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Given that,

  • Ratio of the sides of a rectangle is 12:5.

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So, Let's consider the sides of rectangle are 12X and 5x.

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\dag\;{\underline{\frak{As\;we\;know\;that,}}}\\ \\

  • Each angles of a rectangle are of MEASURE 90°.

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\setlength{\unitlength}{1cm}\begin{picture}(0,0)\thicklines\multiput(0,0)(5,0){2}{\line(0,1){3}}\multiput(0,0)(0,3){2}{\line(1,0){5}}\put(0.03,2.74){\framebox(0.25,0.25)}\put(4.74,0.01){\framebox(0.25,0.25)}\put(2,-0.7){\sf\large 12x}\put(-0.5,-0.4){\bf A}\put(-0.5,3.2){\bf D}\put(5.3,-0.4){\bf B}\put(5.3,3.2){\bf C}\qbezier(0,0)(0,0)(5,3)\put(1.65,1.8){\sf\large 65 cm}\put(5.5,1.5){\sf\large 5x}\end{picture}

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Now, In ∆ABC,

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\bigstar\:{\underline{\sf{\pink{Using\; Pythagoras\; Theroem\;\::}}}}\\ \\

:\implies\sf (AC)^2 = (AB)^2 + (BC)^2\\ \\

:\implies\sf (65)^2 = (12x)^2 + (5x)^2\\ \\

:\implies\sf 4225 = 144x^2 + 25x^2\\ \\

:\implies\sf 4225 = 169x^2\\ \\

:\implies\sf x^2 = \cancel{ \dfrac{4225}{169}}\\ \\

:\implies\sf x^2 = 25\\ \\

:\implies\sf \sqrt{x^2} = \sqrt{25}\\ \\

:\implies{\underline{\boxed{\sf{\purple{x = 5}}}}}\;\bigstar

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Therefore, Sides of Rectangle are,

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  • 12x = 12 × 5 = 60 cm
  • 5x = 5 × 5 = 25 cm

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\therefore\;{\underline{\sf{Hence,\;sides\;of\;rectangle\;are\; {\textsf{\textbf{60\;cm\;and\;25\;cm}}}.}}}



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