Question

In triangle def length of side df has been less than twice length of side de by 2 cm. length of side df exceeds length of side de by 10 cm. perimeter has been 40 cm. length of smallest side of triangle def has been :

Answer 1

In equation (1) DF is 2cm less than twice the length of DE.
In equation (2) DF is 10cm more than the length of DE.
Comparing both equations we get the length of DE, and by that we can figure out the lengths of DF and EF.
Here, EF turns out to be the shortest side.