Question

If the perimeter of ∆ PQR is 40 cm and the ratio are 1:3:4 . Find the sides. Find the longest side of the triangle.
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Answer 1

Step-by-step explanation:

Let sides be = x,3x,4x

8x = 40cm

x = 5cm

Largest side = 4x = 5*4cm = 20cm

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Answer 2

Step-by-step explanation:

ANSWER

Let the sides of triangles are 3x,4x and 5x.

And perimeter of the triangle is 144cm.

So , 3x+4x+5x=144

12x=144

x=12

so, the sides are triangle are 3(12)=36cm, 4(12)=48cm , 5(12)=60cm

so , the longest side is 60 cm.

Area of triangle =

s(s−a)(s−b)(s−c)

here , s=72 and a=36, b=48 c=60

=

72(72−36)(72−48)(72−60)

=

72(36)(24)(12)

=

746496

= 864

So, the area of triangle is 864 cm

2

and the height corresponding to longest side h=

60

2×864

=28.8cm