Kiran's mosaic is made of 5 equal squares of side 20 cm, as shown. She sticks ribbon only along the outer border (orange), not on the dashed lines. How much ribbon does she need?

Question

Accepted Answer

240 cm. The outer border has 12 sides, each 20 cm: 12 × 20 = 240 cm. (400 cm wrongly adds the full perimeter of all 5 squares, including the dashed shared sides.)

Kiran's mosaic is made of 5 equal squares of side 20 cm, as shown. She sticks ribbon only along the outer border (orange), not on the dashed lines. How much ribbon does she need?

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