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Hey there!
c² = 5c
Subtract 5c from both sides:
c² - 5c = 5c - 5c
Simplify :
c² - 5c = 0
c = 5 , c = 0
Equilateral, because the sides are equal
P=2(l + b)
P=2l + 2b
P-2b=2l
P-2b/2=l
C is your answer