Question

Brenda observes that the keyboard and the screen of an open laptop lie on two different planes. In how many lines do the planes containing the keyboard and the screen intersect?

0

2

1

3

Answer 1

keyboard is one plane, and screen is another plane

Answer 2

so two planes intersect in exactly how many lines? have a look at ur laptop and see :)

Answer 3

1

Answer 4

thats right ! two planes intersect in exactly one line - if they intersect