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 ?

Answer 1

Answer: 1

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Step-by-step explanation:

The keyboard and screen can be thought of as flat rigid sheets of paper. They are joined along one single line which is where the hinge is located. Any two planes intersecting will form a single straight line assuming these planes are not parallel to one another.

Answer 2

Answer: One line.

Step-by-step explanation:

We know that a plane is a two dimensional flat platform , which has infinite length and width.It contains infinite number of lines.

The intersection of two planes is a line .

Given statement : Brenda observes that the keyboard and the screen of an open laptop lie on two different planes.

Then In only one line the planes containing the keyboard and the screen intersect .