Question

ABC is an equilateral triangle of perimeter 180cm.If the mid points D,E and F of sides AB,AC,BC respectively are joined , then find the perimeter of trianfle DEF.
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Answer 1

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Answer 2

AD=AF=DF= 30cm
similarly DE & EF= 30cm
  in triangle DEF
 DE+DF+FE= it`s perimeter 
30+30+30= 90 cm
 perimeter= 90cm