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  • Find the perimeter of each of the following shapes : (a) A triangle of sides 3 cm, 4 cm and 5 cm. (b) An equilateral triangle of side 9 cm

Q 6.     Find the perimeter of each of the following shapes :

            (a) A triangle of sides 3 cm, 4 cm and 5 cm.

            (b) An equilateral triangle of side 9 cm.

            (c) An isosceles triangle with equal sides 8 cm each and third side 6 cm.

Answers (1)

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   (a) The perimeter of a triangle = Sum of all three sides
                                                    = 3cm + 4cm + 5cm 
                                                    = 12 cm

 (b) The perimeter of an equilateral triangle
      = Sum of all the sides of  the triangle
       = (9cm +9cm +9cm) 
      = 27cm

(c) Perimeter of a given isosceles triangle 
     = Sum of all sides
     = 8cm + 8cm +6cm
     = 22 cm

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manish

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