Learning how to find the measure of a minor arc for a circle

The video tutorial explains how to measure arcs in a circle, focusing on minor arcs. It begins by defining different types of arcs and central angles. The instructor then guides students through solving a problem to find the measure of a specific minor arc, STP, using known angles and the properties of a circle. The solution involves calculating the unknown angle by subtracting known angles from 180 degrees, the measure of a straight line. The tutorial concludes with a recap of the solution and key concepts.

What is a minor arc?

• An arc that measures more than 180 degrees

• An arc that measures less than 180 degrees

• An arc that measures exactly 90 degrees

• An arc that measures exactly 180 degrees

Which of the following is true about a central angle?

• It is an angle with its vertex on the circle and endpoints inside the circle

• It is an angle with its vertex outside the circle and endpoints on the circle

• It is an angle with its vertex at the center of the circle and endpoints outside the circle

• It is an angle with its vertex at the center of the circle and endpoints on the circle

In the context of the problem, what is the significance of the arc STP?

• It is a minor arc that needs to be calculated

• It is a semicircle that needs to be calculated

• It is a major arc that needs to be calculated

• It is a tangent line that needs to be calculated

How do you determine the unknown angle in the problem?

• By dividing the sum of known angles by 2

• By multiplying all known angles

• By adding all known angles and subtracting from 180 degrees

• By adding all known angles and subtracting from 360 degrees

What is the measure of the minor arc STP?

• 130 degrees

• 50 degrees

• 90 degrees

• 180 degrees