Understanding Angles in a Parallelogram

The video tutorial introduces the concept of a parallelogram, a quadrilateral with opposite sides parallel. It explains key properties, such as opposite angles being congruent and consecutive angles being supplementary. The tutorial provides examples, including a practice problem, to illustrate these properties. By the end, viewers should understand how to calculate angles in a parallelogram using these properties.

What is the defining property of a parallelogram?

• All angles are right angles

• Opposite sides are parallel

• Diagonals are equal

• All sides are equal

If angle B in a parallelogram is 120 degrees, what is the measure of angle D?

• 60 degrees

• 90 degrees

• 120 degrees

• 150 degrees

What is the relationship between consecutive angles in a parallelogram?

• They are equal

• They are supplementary

• They are congruent

• They are complementary

If angle D is 120 degrees, what is the measure of angle A?

• 60 degrees

• 150 degrees

• 90 degrees

• 120 degrees

In a parallelogram, if angle C is 80 degrees, what is the measure of angle A?

• 100 degrees

• 80 degrees

• 140 degrees

• 120 degrees

If angle C is 80 degrees, what is the measure of angle B?

• 100 degrees

• 60 degrees

• 80 degrees

• 120 degrees

What is the sum of any two consecutive angles in a parallelogram?

• 360 degrees

• 270 degrees

• 180 degrees

• 90 degrees