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= x + 2x +(x + 4)
= 3x + x + 4
= 4x + 4
=x+2x+(x+4)
=4x+4
x=4/4
x=1
1+2+(1+4)
=3+1+4
=8
Jadi kelilingnya adalah 8 cm
Insyaallah bermanfaat