Question

The perimeter of a triangle is 60 cm and its sides are in the ratio 3 : 4 : 5. The length of the sides of the triangle are _________

a,10cm, 20cm, 30cm

b,15 cm, 20 cm, 25 cm

c,20 cm, 20 cm, 20 cm

d,15 cm, 35cm, 10cm

Answer 1

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Let the sides be 3x, 4x and 5x. Then,

➝ 3x + 4x + 5x = 60 cm

It is because the total sum of the sides i.e. perimeter of the triangle is 60 cm.

➝ 12x = 60 cm

➝ x = 60 cm / 12

➝ x = 5 cm

Hence,

The required length of the sides:

• 3x = 15 cm
• 4x = 20 cm
• 5x = 25 cm

And we are done! :D

⛱️
`\large{ \blue{ \bf{FadedElla}}}`

Answer 2

Hey buddy, here is your answer. Hope it helps u.

Explanation:

Let the unknown number be x

Perimeter of triangle= a+b+c

60=3x+4x+5x

60=12x

x= 60/12

X=5 cm

So the first side=3*x

=3*5=15

Second side=4*5=20

Third side=5*5=25

Answer is b

By-Kelyn