Answer :

__Given:-__ ABCD is a rhombus

E,F,G,H are the mid points of AB,BC,CD,DA

__Formula used:-__ Line joining midpoints of 2 sides of triangle

Is parallel and half of 3^{rd} side

__Solution:-__

BD is diagonal of rhombus

EH is the line joined by midpoints of triangle ABD,

∴EH is parallel and half of BD

GF is line joined by midpoints of side BC&BD of triangle BCD

∴GF is parallel and half BD

⇒ If HE is parallel to BD and BD is parallel to GF

∴ It gives HE is parallel to GF

⇒ If HE is half of BD and GF is also half of BD

∴ It gives HE is equal to GF

⇒ AC is another diagonal of rhombus

GH is the line joined by midpoints of triangle ADC,

∴GH is parallel to AC

∴GH is half of AC

FE is line joined by midpoints of side BC&AB of triangle ABC

∴FE is parallel to AC

∴ FE is half of AC

⇒ If GH is parallel to AC and AC is parallel to FE

∴ It gives GH is parallel to FE

⇒ If GH is half of AC and FE is also half of AC

∴ It gives GH is equal to FE

As diagonals of rhombus intersect at 90°

And AC is parallel to FE and GH

All angles of EFGH is 90°

All angles are 90° and opposite sides are equal and parallel

__Conclusion:-__

EFGH is a rectangle

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