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Let the sides of the triangle be 3x cm, 4x cm and 5x cm.
Perimeter of the triangle = 144 cm
∴ 3x + 4x + 5x = 144
⇒ x = 12
So, the sides of the triangle are 36 cm, 48 cm and 60 cm.
Semi perimeter of triangle, s = 72 cm
Area of triangle=864cm²
Longest side = 60 cm
Also, area of triangle =(b×h)/2
864×2=b×h
1728=60×h
h=28.8cm
Perimeter of the triangle = 144 cm
∴ 3x + 4x + 5x = 144
⇒ x = 12
So, the sides of the triangle are 36 cm, 48 cm and 60 cm.
Semi perimeter of triangle, s = 72 cm
Area of triangle=864cm²
Longest side = 60 cm
Also, area of triangle =(b×h)/2
864×2=b×h
1728=60×h
h=28.8cm
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