Math, asked by dlakshmidevi51, 27 days ago

the side of triangle is 5/7 cm.the perimeter of the triangle is​

Answers

Answered by dharshini08071977
0

Answer:

15/7 cm

Step-by-step explanation:

perimeter=sum of all sides

=5/7+5/7+5/7

=15/7 cm

Answered by lkg13
0

Answer: 60  

3

cm  

2

.

Step-by-step explanation: Correct option is A)

Given sides in the ratio 3:5:7

perimeter of the triangle =60cm

3x+5x+7x=60

⇒15x=60

⇒x=60/15

⇒x=4

3x=3×4=12cm

5x=5×4=20cm

7x=7×4=28cm

Let S be the semiperimeter of given triangle.

S=  

2

1

(a+b+c)

=  

2

1

⋅60

=30

Now use formula foe area of triangle

Area =  

30(30−12)(30−20)(30−28)

 

=  

30⋅18⋅10⋅2

 

=  

60⋅180

 

=  

10800

 

=  

3600⋅3

 

=60  

3

cm  

2

 

∴ Area of triangle =60  

3

cm  

2

.

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