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Selena1611

Perimeter

Find perimeter of rectangle whose length is 40cm and a diagonal is 41 cm.

The formula in finding the perimeter of rectangle is [tex] \tt P = 2(l + w)[/tex]

  • [tex] \tt P = 2(l + w)[/tex]
  • [tex]\tt P = 2(40cm + 41cm)[/tex]
  • [tex] \tt P = 2(81cm)[/tex]
  • [tex] \tt P = 162cm[/tex]

Therefore, the perimeter of rectangle is 162cm

#CarryOnLearning
The width w = sr(41^2 - 40^2) using Pythagoras. [It is a 9, 40, 41 Pythagorean triple!]
So w = 9cm
Perimeter = 2(length + width) = 2(9 + 40) = 98cm

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