D, E, F are the mid-point of the sides BC, CA and AB respectively of ABC Then
DEF is congruent to triangle
A) ABC
B) AEF
C) BFD,CDE
D) AFE,BFD,CDE
give ans. with short explanation
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Given: In ΔABC, D,E and F are midpoints of sides AB,BC and CA respectively.
BC=EC
Recall that the line joining the midpoints of two sides of a triangle is parallel to third side and half of it.
Therefore,we have:
DF=d
2
1
BC
⇒
BC
DF
=
2
1
....(1)
AC
DE
=
2
1
....(2) and
AB
EF
=
2
1
....(3)
From (1), (2) and (3) we have
But if in two triangles, sides of one triangle are proportional to the sides of the other triangle, then their corresponding angles are equal and hence the two triangles are similar
Therefore, ΔABC∼ΔEDF [By SSS similarity theorem]
Hence area of ΔABC: area of ΔDEF=4:1
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