Consider what you know about parallelograms.

a

Which of the following quadrilaterals are not parallelograms? Select all that apply.

A

B

C

D

E

A

B

C

D

E

b

In part (a), we found that the quadrilateral pictured below is not a parallelogram. What type of quadrilateral is it?

A kite

A

A rhombus

B

A rectangle

C

A trapezoid

D

A kite

A

A rhombus

B

A rectangle

C

A trapezoid

D

Easy

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Illustrate a statement about a geometric property by demonstrating the statement with multiple examples, or deny the statement on the basis of a counter-example, with or without the use of dynamic geometry software