Measuring Angles with a Protractor

This video tutorial by Mr. J covers how to measure angles using a protractor. It begins with an introduction to the topic, followed by a step-by-step guide on aligning the protractor with the angle's vertex and baseline. The tutorial explains how to read the protractor and understand the tick marks for accurate measurement. The video concludes with five example problems, demonstrating the process of measuring both acute and obtuse angles.

What is the first step in measuring an angle with a protractor?

• Align the center point with the vertex

• Align the baseline with the angle's arm

• Identify if the angle is acute or obtuse

• Read the angle measurement

Tags

CCSS.4.MD.C.6

How can you determine if an angle is obtuse using a protractor?

• It measures more than 90 degrees

• It measures exactly 90 degrees

• It measures less than 90 degrees

• It measures less than 45 degrees

Tags

CCSS.4.MD.C.6

What do the smallest tick marks on a protractor represent?

• 5 degrees

• 15 degrees

• 10 degrees

• 1 degree

Tags

CCSS.4.G.A.1

In example 1, what is the angle measurement if the angle is acute?

• 110 degrees

• 70 degrees

• 20 degrees

• 160 degrees

Tags

CCSS.4.G.A.1

In example 2, which angle measurement is correct for an obtuse angle?

• 70 degrees

• 20 degrees

• 160 degrees

• 45 degrees

Tags

CCSS.4.MD.C.6

In example 3, what is the angle measurement if the angle is slightly more than 90 degrees?

• 95 degrees

• 115 degrees

• 105 degrees

• 85 degrees

Tags

CCSS.4.G.A.1

In example 4, what is the angle measurement if the angle is acute?

• 155 degrees

• 95 degrees

• 135 degrees

• 45 degrees

Tags

CCSS.4.G.A.1

In example 5, what is the angle measurement for an obtuse angle?

• 32 degrees

• 102 degrees

• 72 degrees

• 132 degrees

Tags

CCSS.4.MD.C.6

What should you do if the arm of the angle is aligned with the baseline?

• Ignore the baseline

• Use both inside and outside numbers

• Use the outside numbers

• Use the inside numbers

Tags

CCSS.4.MD.C.6

What is the importance of using the correct track of numbers on a protractor?

• To accurately measure the angle

• To ensure the protractor is not damaged

• To avoid using the wrong protractor

• To make the protractor look neat

Tags

CCSS.4.MD.C.6