38cm + 65cm + 47cm = 150cm
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perimeer of the triangle = sum of all the sides = 18 +18+11= 47 cm hence perimeter is 47 cm
68 cm is the perimeter of 68 cm.
The perimeter of a triangle is the sum of its 3 sides.
If each side of a square is 10 cm, the perimeter is 4 x 10 cm = 40 cm.
30 cm.