Special Cases of the Parallelogram

A square is a .................... with a right angle.

• triangle

• rhombus

The quadrilateral in which all sides are equal in length is called ..................... .

• rectangle

• square

The parallelogram in which diagonals are perpendicular is called ............................. .

• rhombus or square

• rectangle or quadrilateral

The parallelogram in which diagonals are .................... is called a rectangle.

• equal in length

• perpendicular

ABCD is a parallelogram in which  $m\left(\angle A\right)=50\degree$  , then  $m\left(\angle B\right)=$  ................

•  $130\degree$  

•  $180\degree$  

A rectangle is a ..................... with a right angle.

• parallelogram

• rhombus

The quadrilateral in which diagonals bisect each other is called ......................... .

• parallelogram

• triangle

If ABCD is a rhombus, the ............................... .

• 
  

  $AC\ \perp\ BD$
  

• $AB\ \perp\ CD$

The quadrilateral in which two opposite sides are parallel is called ......................... .

• parallelogram

• pentagon

In the parallelogram XYZL, if  $m\left(\angle X\right)=\frac{1}{2}m\left(\angle Y\right)$  , then  $m\left(\angle Y\right)=$  ............... .

•  $120\degree$  

•  $60\degree$