Question

1. The area of a triangle is 150 cm and its sides
are in the ratio 3: 4:5. What is its perimeter?​

Answer 1

Answer:

this is the answer for your question

unit is wrong for the area

Answer 2

Answer:

let the sides be 3x, 4x and 5x respectively

These are the sides of a right angled triangle.

(3x)²+(4x) ²=(5x) ²[you can check also]

so angle between 3x and 4x will be a right angle

so one out of 3x and 4x is base and another one is the height

we know that area of a triangle =1/2×base×height

150=1/2×3x×4x

150=6x²

x²=25

x=5

therefore 3x=3×5=30cm

4x=4×5=20cm

5x=5×5=25cm

perimeter=3x+4x+5x=30+20+25=75cm