Measuring Angles with a Protractor

The video tutorial explains how to use a protractor to measure angles. It begins with an introduction to various measuring tools and focuses on the protractor, describing its features such as the semicircle shape and dual rows of numbers. The tutorial provides a step-by-step guide on how to align the protractor with an angle's vertex and base line to measure angles accurately. It includes examples of measuring acute, right, and obtuse angles, emphasizing the importance of starting from zero on the correct row. The video concludes with a summary of the process.

What instrument is used to measure angles?

• Measuring Cup

• Protractor

• Scale

• Ruler

Tags

CCSS.4.MD.C.6

What shape is a protractor typically?

• Circle

• Rectangle

• Triangle

• Semicircle

Tags

CCSS.4.MD.C.6

Where should the center point of the protractor be placed when measuring an angle?

• Anywhere on the arc

• On the vertex of the angle

• On the midpoint of the hypotenuse

• Outside the angle

Tags

CCSS.4.MD.C.6

What is the correct way to align the protractor when measuring an angle?

• Align the top line with 0 degrees

• Align the bottom line with 0 degrees

• No specific alignment needed

• Align the center point with 90 degrees

Tags

CCSS.4.MD.C.6

Which row of numbers on a protractor should be used to start counting from zero?

• Top row

• Bottom row

• Either row

• Neither row

Tags

CCSS.4.MD.C.6

What type of angle measures 60 degrees?

• Acute angle

• Straight angle

• Obtuse angle

• Right angle

Tags

CCSS.4.G.A.1

How many degrees does the first example angle measure?

• 60 degrees

• 50 degrees

• 90 degrees

• 120 degrees

Tags

CCSS.4.G.A.1

What type of angle is formed when it measures 90 degrees?

• Acute

• Right

• Reflex

• Obtuse

Tags

CCSS.4.G.A.1

What is the measurement of the angle in the final example?

• 120 degrees

• 180 degrees

• 90 degrees

• 50 degrees

Tags

CCSS.4.G.A.1

What type of angle is 120 degrees?

• Right

• Acute

• Obtuse

• Straight

Tags

CCSS.4.G.A.1