Answer:

put s[ ( s-a) ( s-b ) ( s-c)].

a = 13x b= 14 X c= 15 X

Area = 168 cm^2

Step-by-step explanation:

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Verified answer

Answer:

perimeter = 13x+14x+15x

84 = 42x

x= 84/42

x=2

13x=13*2=26

14x=14*2=28

15x=15*2=30

Step-by-step explanation:

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