Using a semi circle to determine the measure of a minor arc

The video tutorial explains how to measure a minor arc, specifically Arc AB, which is less than 180 degrees. It discusses the concept of intersecting lines and vertical angles, emphasizing the congruence of opposite angles. The tutorial also covers calculating angles in a circle, using the diameter to determine semicircles and subtracting known angles to find unknown ones.

What type of arc is arc AB if it measures less than 180 degrees?

• Semicircle

• Minor arc

• Full circle

• Major arc

What are vertical angles?

• Angles that are on the same side of a transversal

• Angles that are opposite each other when two lines intersect

• Angles that are complementary

• Angles that are adjacent

What is the measure of a semicircle?

• 360 degrees

• 90 degrees

• 180 degrees

• 270 degrees

If line EB is the diameter of a circle, what is the measure of the angle opposite to a 50-degree angle?

• 130 degrees

• 180 degrees

• 50 degrees

• 100 degrees

How do you find the measure of an angle in a semicircle if one angle is given?

• Subtract the given angle from 180

• Divide the given angle by 2

• Add the given angle to 180

• Multiply the given angle by 2