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Question


A diagonal of a parallelogram divides it into two congruent triangles.


Options:
A .   True
B .   False
C .   Three angles are known.
D .   Length of sides should be known
Answer: Option A
:
A

A Diagonal Of A Parallelogram Divides It Into Two Congruent ...
Suppose ABCD is a parallelogram and BD is the diagonal.
There are two triangles - Δ ABD and Δ CDB
In Δ ABD and Δ CDB,
AD = BC   (opposite sides of a parallelogram are equal)
AB = CD   (opposite sides of a parallelogram are equal)
BD is common
By SSS criterion of congruency,
Δ ABD Δ CDB
Hence, the given statement is true.



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