Assuming the object is a rectangle, the perimeter is (2 x 7cm) + (2 x 10 cm) = 34cm
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The perimeter is 20*sqrt(2) cm = 28.2843 cm
30 cm
Perimeter = 6*10 = 60 cm
The perimeter of 100 square in cm is 40cm. Each side is 10cm, you get 40 when you add the four sides.
40 cm (10cm x 4 sides = 40cm)