A wire was shaped to form a square of area 81cm\(^2\). An equilateral triangle was…

Mathematics NECO 2002

A wire was shaped to form a square of area 81cm\(^2\). An equilateral triangle was formed by the same wire,What is the length of a side of the triangle formed?

  • 3cm
  • 6cm
  • 9cm
  • 12cm checkmark
  • 27cm

The correct answer is: D

Explanation

Area of a square = L X L = 81

: L = 9

Perimeter of square = 4 X L 

 4 X 9 = 36cm

An equilateral triangle with equal sides:

 36/3 = 12cm

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