SOLUTION: Two sides of a triangle are 7cm and 13cm long. The perimeter is 30cm. What is the equation that models this problem?

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Question 998435: Two sides of a triangle are 7cm and 13cm long.
The perimeter is 30cm.
What is the equation that models this problem?
Answer by fractalier(6550) About Me  (Show Source):
You can put this solution on YOUR website!
P = a + b + c
30 = 7 + 13 + c
30 = 20 + c
Take your pick.