Question

please help me to do this sum

Answer 1

Perimeter of 1st triangle = 3 x 24 = 72cm

Perimeter of second triangle  = 3 x 24/2 = 72/2

Perimeter of 3rd = 72/4

So on

So the sum of the perimeter will be

72 + 72/2 + 72/4 + 72/8 + ................

72( 1 + 1/2 + 1/4 + 1/8......)

72  [1/ (1-1/2)]                              (Sum of ∞ g. p. a/1-r)

72 x 2 = 144