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 ......

Fill in the Blanks

Reflex angles are more that 180 but less than

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