Question

The lengths of sides of a triangle are in the ratio 3 : 4 : 5 and its perimeter is 120 cm, find its area. ​

Answer 1

Answer:

3x+4x+5x=120

12x=120

x=120/12

x=10

therefore.

3×10=30

4×10=40

5×10=50

put cm atrr every value.

Step-by-step explanation:

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Answer 2

Answer:

The length of the sides of the triangle are 30 cm, 40 cm and 50 cm respectively.

Step-by-step explanation:

Let the sides of the triangle in the ratio 3:4:5 be 3x, 4x and 5x

Given, Perimeter = 120

By condition,

3x + 4x + 5x = 120

=> 12x = 120 => x = 120 / 12 = 10

First side = 3x = 3 × 10 = 30 cm

Second side = 4x = 4 × 10 = 40 cm

Third side = 5x = 5 × 10 = 50 cm

The formula for finding the area is 1/2 × b × h

Now, you can obtain the area of the triangle.

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