In Fig 7.31, `DA _|_ AB, CB _|_ AB and AC = BD`. State the three pairs of equal parts in `Delta ABC and Delta DAB`. Which of the following statements is meaningful?
`(i)` `Delta ABC cong Delta BAD`
`(ii)` `Delta ABC cong ABD`

Explanation

The three pairs of equal parts are:

`/_ABC = /_BAD (= 90^@)`

`AC = BD ` (Given)

`AB = BA` (Common side)

From the above, `/_\ABC cong /_\BAD ` (By `RHS` congruence rule).

So, statement `(i)` is true

Statement `(ii)` is not meaningful, in the sense that the correspondence among the vertices
is not satisfied.