Measuring Angles

Measuring Angles

4.MD.6- 2020

Let's Review

• What's the tool used to measure angles?

• How do you measure angles?

Multiple Choice

What is this tool called and what is it used for?

• A ruler used to measure lines.
• A protractor used to measure lines.
• A ruler used to measure angles.
• A protractor used to measure angles.

Multiple Choice

The center of the protractor should be _________________

• at the end of the angle where the arrow is

• where the two lines meet at the vertex

Focus!!!!!!!

• Sometimes a question may have more than one angle

• It's okay, just focus, highlight the angle that it asks a question about.

Multiple Choice

What kind of angle is SRV?

• Acute

• Obtuse

• Right

• Straight

Multiple Choice

What is the angle measure of SRV?

• 30°

• 60°

• 90°

• 180°

Sometimes things will be visually obvious!

You know what a right angle looks like you know exactly how many degrees it is. Don't hesitate, Just Do It!

Multiple Choice

What kind of angle is < QRP?

• Acute because it is 92°

• Obtuse because it is 108°

• Right because it is 180°

• Straight because it is 180°

Remember......

• Straight angles are exactly 180°

• Right angles are exactly 90°

• Acute angles are less than 90°

• Obtuse angles are more than 90° but less than 180°

• Reflex angles are ......

Let's see if you remember how to measure!

Quick quiz

STOPPPP!!

Remember when measuring angles, you need to

-line up the vertex with the middle of the protractor

-place the bottom angle on zero

-the count by 5s, until you have to count by 1s

Multiple Choice

Which is closest to the measure of Angle G of the clothes hanger?

• 35°

• 45°

• 145°

• 155°

Multiple Choice

Which of the following books is open 180°?

Multiple Choice

What is the measure and type of the angle shown in the picture?

• 53 degrees; acute

• 53 degrees; obtuse

• 127 degrees; acute

• 127 degrees; obtuse

Multiple Choice

What is the measure of 〈FOE?

• 10 degrees

• 20 degrees

• 30 degrees

• 40 degrees

Multiple Choice

What is the measure of the angle shown in the picture?

• 30 degrees

• 35 degrees

• 140 degrees

• 145 degrees