Math, asked by anspans77, 1 year ago

if each diagonal of a quadrilateral separates it into two triangles of equal area , then show that the quadrilateral is a parallelogram.its urgent

Answers

Answered by Anonymous
3

Its simple as diagonal has divided the quad. In two congruent triangle so just show that opposite sides are equal to one another and therefore its a parallelogram.


anspans77: but can u write the answer by solving
Anonymous: U can also do this.
anspans77: ok
Answered by BrainlyQueen01
3
In quadrilateral ABCD, AC is a diagonal.

∴ ar \Delta ABC = ar \Delta ADC

ar \Delta AOB + ar \Delta BOC = ar \Delta AOD + ar \Delta DOC.... (i)

In quadrilateral ABCD, BD is diagonal

∴ ar \Delta ABD = ar \Delta BCD

ar \Delta AOD + ar \Delta AOB = ar \Delta BOC + ar \Delta COD.... (ii)

From equation (i) and (ii),
We have ;

ar \Delta AOD - ar \Delta BOC = ar \Delta BOC - ar \Delta AOD

So,

2ar \Delta AOD = 2ar \Delta BOC

\Delta AOD =\Delta BOC

ar \Delta AOD + ar \Delta AOB = ar \Delta AOB + ar \Delta BOC

ar \Delta ADB = ar \Delta ABC

\Delta ADB and \Delta ABC having common base AB and line between two lines AB and DC.

∴ AB || DC

Similarly we can prove that AD || BC.

∴ ABCD is a parallelogram.
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