Sagot :
I believe that when you calculate a triangles length that you must add all the sides together to get the perimeter.
Let's say that 3m is side A and 18m (that's what 4 times 3 is)is side B.
Therefore, A + B + C = 27m
The C would be the third side, which seems to be what you're looking for.
So, 3m + 18m = 21m
27m - 21m = 6m
Answer: First side =5 m
Second side= 2 m
Third side )=20 m
Step-by-step explanation:
Let x be the length of the second side ( in meter) of the triangle .
Then, the first side will be x+3
And the third side will be 4(x+3).
Given : The perimeter of the triangle : 27 m
Then, we have :
[tex]x+x+3+4(x+3)=27\\\\\Rightarrow\ 2x+3+4x+12=27\\\\\Rightarrow\ 6x+15=27\\\\\Rightarrow\ 6x=27-15\\\\\Rightarrow\ 6x=12\\\\\Rightarrow\ x=\dfrac{12}{6}=2[/tex]
Thus , the length of second side= 2 m
Length of first side = 2+3=5 m
Length of third side = 4(5)=20 m