Take cut-outs of two identical parallelograms, say ABCD and A′B′C′D′ (Fig 3.19).
Here is the same as
except for the name. Similarly the other corresponding
sides are equal too.
Place over
. Do they coincide? What can you now say about the lengths
and
?
Similarly, examine the lengths and
. What do you find?
You may also arrive at this result by measuring and
.
Take cut-outs of two identical parallelograms, say ABCD and A′B′C′D′ (Fig 3.19).
Here is the same as
.
Also, is the same as
Place over
. They coincide with each other.
By the properties of a parallelogram, the lengths and
are equal and parallel lines.
The lengths and
are equal and parallel lines.