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Given, Side of triangle are in ratio 3:4:5 and their perimeter 144 cm
Let the sides of triangle be 3x,4x,5x
Perimeter 3x+4x+5x= 144 cm
12x=144
∴x=12
Then sides of triangle are 3x= 3×12= 36 cm,
4x= 4×12= 48 cm,
5x= 5×12= 60 cm.
Now,Semi perimeter, s=
2
Sumofsidesoftriangle
=
2
36+48+60
=72cm
Using heron's formula, Area of triangle=
s(s−a)(s−b)(s−c)
=
72(72−36)(72−48)(72−60)
=
72×36×24×12
=864cm
2
Using altitude, area of triangle=
2
1
× base × altitude =864cm
2
=
2
1
×60× altitude =864
∴ altitude =
60
864×2
=28.8cm
So, altitude corresponding to largest side is 28.8 cm.
Answered By
toppr
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