Concept of rectangle — lesson. Mathematics CBSE, Class 8.

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A parallelogram whose each angle is a right angle is called a rectangle.

Now we are going to define a rectangle

$ABCD$ as a quadrilateral is a parallelogram whose each interior angle is

$90°$ .

Thus, if

$ABCD$ is a rectangle then

$AB=BC=CD=AD$ and

$AB||CD$ and

$BD||AC$ .

Important!

A rectangle has all the properties of a parallelogram with interior.

In a rectangle, the following properties are true:

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4. Concept of rectangle