Question

if the diagonals of a quadrilateral bisect each other at right angle then prove that the quadrilateral is a rhombus......... explain​

Answer 1

Step-by-step explanation:

Show that if the diagonals of a quadrilateral bisect each other at right angles, then it is a rhombus. Sol: We have a quadrilateral ABCD such that the diagonals AC and BD bisect each other at right angles at O. Their corresponding parts are equal. Thus, the quadrilateral ABCD is a rhombus.

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Answer 2

Answer:

To prove -:

If diagonals of a quadrilateral bisect each other ar right angles, then it is a rhombus.

Proof-:

Let a quadrilateral ABCD whose diagonals intersect at O.

In ∆AOB and ∆AOD,

OB = OD (Given)

AO = AO (Common)

∠AOB = ∠AOD (90°)

∆AOB ≅ ∆AOD (by SAS criteria)

∴AB = AD (by c.p.c.t)............(i)

Now,

In ∆BOC and ∆COD,

OB = OD (given)

CO = CO (common)

∠BOC = ∠COD(90°)

∆BOC ≅ ∆COD (by SAS criteria)

∴BC = CD (by c.p.c.t).............(ii)

Similarly,

We can prove that,

AB = BC..........(iii)

CD = AD..........(iv)

From (i),(ii),(iii) and (iv)

AB = BC = CD = AD

Since, all the sides of a rhombus are equal and it is given that the diagonals bisect at 90°,then ABCD is a rhombus.