Math, asked by paramasivamsanthosh, 4 months ago

Sides of a triangle are in the ratio of 12 17:25 and
its perimeter is 540
. Find its area​

Answers

Answered by Anonymous
2

Step-by-step explanation:

hope it helps you.。◕‿◕。

Attachments:
Answered by brainlyofficial11
2

Given :-

  • ratio of sides of a triangle is 12:17:25
  • perimeter of the triangle = 540 cm

To Find :-

  • find the area of the triangle ?

Solution :-

let the sides of the triangle are 12x , 17x and 25x

and we know that,

 \boxed{ \bold{perimeter \: of \triangle = sum \: of \: sides}}

 \bold{: \implies 12x + 17x + 25x = 540 }  \\   \\  \bold{: \implies 54x = 540}  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \\  \\  \bold{: \implies x = \cancel  \frac{540}{54}  } \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \\  \\  \bold{: \implies x = 10 }\:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \: \:  \:  \:

so, the sides of the triangle are

  • 12 × 10 = 120 cm
  • 17 × 10 = 170 cm
  • 25 × 10 = 250 cm

__________________________

now, find the area of the triangle by using heron's formula

if the sides of the triangle are a, b and c then,

 \boxed { \orange{ \bold{ar( \triangle) =  \sqrt{s(s - a)(s - b)(s - c)} }}} \\

where,

 \boxed{  \bold{\orange{s = \frac{perimeter}{2}  }}}

and here

  • a = 120 cm
  • b = 170 cm
  • c = 250 cm

then,

 \bold{s =   \cancel\frac{540 \: cm}{2} } \:  \:  \:  \:  \:  \:  \:  \:  \:  \\  \\  \bold{ : \implies s = 270 \: cm }

now, area of the triangle

 \bold{: ↦ \:  \sqrt{s(s - a)(s - b)(s - c)} }  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \: \\  \\  \bold{:↦ \:  \sqrt{270(270 - 120)(270 - 170)(270 - 250)}  } \\  \\  \bold{:↦ \:  \sqrt{270 \times 150 \times 100 \times 20}  } \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \\  \\  \bold{:↦ \:  100 \sqrt{27 \times 15 \times 10 \times 2}   } \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \\  \\  \bold{: ↦ \:100 \sqrt{8100}  }\:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:   \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \: \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \\  \\  \bold{: ↦ \: 100 \times 90}\:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \: \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:    \\  \\  \bold{: ↦ \:9000  \:  {cm}^{2}  }\:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:

hence, area of the triangle is 9000 cm²

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