Question

In triangle ABC d,e,f are the midpoints of ab ,bc and ca . If AB =6cm , bc= 7.2 cm and ca = 7.8 cm then find the perimeter of triangle def

Answer 1

Answer:

Step by step explanation

Perimeter of a triangle is sum of all its sides

So in above case add all the sides then that will be its perimeter

AB+BC+CA=6+7.2+7.8=6+15=21

Answer 2

Answer:

10.5

Step-by-step explanation:

If we use mid-point theorem

  --------> the value of  DF=1/2*BC=3.6cm

                                    EF=1/2*AB=3cm

                                    DE=1/3*AC=3.9cm

which implies,

                      3.9+3.6+3=10.5cm