Question

I need help with these short answers #19 - #21

Answer 1

In a diagram to mark that two lines are perpendicular, we put the following symbol:

in one of the angles that they form.

Also, if two lines are congruent, we mark them with the same symbol.

From the given diagram we get:

`AC\perp BD,`
`AD\cong CD\text{.}`

Answer:

19.- T.

20.- T.

21.- F.