Answer:
70 cm
Explanation:
You want the perimeter of shape B given that shape A has a perimeter of 56 cm.
Perimeter
The perimeter of shape A is 8 times the length of the edge of one of the small squares. The perimeter of shape B is 10 times the length of the edge of a small square. You can find these numbers by counting the outside edges.
The perimeter of shape B is 10/8 times the perimeter of shape A:
Pb = (10/8)(56 cm) = 70 cm
The perimeter of B is 70 cm.
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Additional comment
You will notice that the perimeter of each figure is the same as the perimeter of its bounding rectangle. For shape B, that is 2 squares high by 3 squares wide. The "inside corners" don't change the perimeter.
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