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A regular pentagonal floor tile has each side 13 cm. What length of ribbon runs exactly once around its edge?

Class 6MensurationMensuration
  • A18 cm
  • B52 cm
  • C65 cm
  • D78 cm

Step-by-Step Solution

A regular pentagon has 5 equal sides, so cm. 52 cm is (that would be a square) and 78 cm is (a hexagon) — count the sides before multiplying. 18 cm comes from adding 13 + 5 instead of multiplying.
Answer: C) 65 cm

Key idea: Perimeter — the journey around

Imagine an ant walking around the edge of a shape and returning to where it started. The total distance it walks is the perimeter. For any closed shape: **add up every side**. Order doesn't matter; just include each side once.

For a triangle with sides 3, 4, 5: perimeter = 3 + 4 + 5 = 12. For an irregular shape: add every edge.

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