Answer:
11 cm
Explanation:
2x+x+6+x+4=30
4x+10=30
-10. -10
4x=20
/4. /4
x=5
now we find each length to find the longest
2(5)
10 cm
5+6
5+4
9 cm
11 is the biggest one
Hopes this helps have a wonderful day
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