1.

In triangle abc d,e,f are midpoints ab is 5.8 cm ef is 6 cm and fd is 5 cm find bc and ac​

Answer»

Answer:

Given,

AB=6 cm,BC=4.8 cm and CA=5.6 cm

D,E and F are the mid POINTS of sides BC,CA and AB of △ABC

To find: The perimeter of △DEF

Given,

E and F are the MIDPOINTS of sides CA and AB

⇒AE=EC and AF=FD

∴

EC

AE

=

FB

AF

⇒EF=

2

1

BC[ By mid point theorem ]

⇒EF=

2

1

×4.8=2.4 cm

Similarly,

DE=

2

1

AB=

2

1

×6=3 cm

FD=

2

1

AC=

2

1

×5.6=2.8 cm

∴ Perimeter of △DEF=DE+EF+FD

=3+2.4+2.8

=8.2 cm

Step-by-step explanation:

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