Angle Relationships and Scale Factors

The video tutorial covers practice problems from lesson 14, focusing on angle calculations. It explains how to determine angles using supplementary and vertical angles, congruent angles through translation and rotation, and angle calculations with non-parallel lines. The tutorial also discusses identifying scaled copies and calculating scale factors.

If angle DBC is 50 degrees, what is the measure of angle ABC if they are supplementary?

• 50 degrees

• 130 degrees

• 180 degrees

• 90 degrees

Which of the following is true about vertical angles?

• They add up to 90 degrees

• They are always equal

• They are never equal

• They are always supplementary

If angle ABC is 19 degrees, what is the measure of angle ECF after a translation?

• 38 degrees

• 19 degrees

• 0 degrees

• 180 degrees

What is the result of a 180-degree rotation of angle ABC?

• The angle becomes supplementary

• The angle doubles

• The angle remains the same

• The angle becomes zero

When two lines are not parallel, how do you determine the angles formed?

• Use supplementary angles independently

• Assume they are equal

• Use congruent angles

• Assume they are vertical angles

If one angle is 70 degrees, what is the measure of its supplementary angle?

• 110 degrees

• 90 degrees

• 180 degrees

• 70 degrees

How can you tell if two figures are scaled copies of each other?

• By checking if they have the same perimeter

• By checking if they have the same area

• By checking if all sides are equal

• By checking if all angles are congruent

What is the scale factor if a side of the original figure is 2 units and the corresponding side in the scaled figure is 6 units?

• 4

• 1

• 3

• 2

If a figure is scaled by a factor of 3, what happens to its side lengths?

• They halve

• They triple

• They double

• They remain the same

What is the reciprocal of a scale factor of 3?

• 1/2

• 3

• 1/3

• 1