Measuring Angles

Measuring Angles

4th Grade 2020

There are 4 types of angles

• Acute

• Obtuse

• Right

• Reflex

Acute Angles

• small

• Less than 90 degree

• Example: Angles that are 18,45,62,89,67,33, 22, 15, and on and on!!!!

• All angles that measure1-89 degrees

Multiple Choice

Which of the following angles measures are not an acute angle?

• 55 degrees

• 88 degrees

• 90 degrees

• 15 degrees

Multiple Choice

Which of the following is an acute angle?

• 32 degrees

• 91degrees

• 180 degrees

• 90 degrees

Obtuse Angles

• big, large

• they are more than 90 degrees

• 90-179

• Example can be angles that are: 92,144,179,101,153,145,120, and on and on and on

Multiple Choice

Jane measures an angle and says that it's measurement is 94 degrees. Did Jane measure an obtuse angle or acute angle?

• obtuse

• acute

Right Angle

• measures exactly 90 degrees

• can't be more than 90 can't be less than 90

• it look just like and uppercase letter L

• You can find a right angle in the corner of you paper, corner of the window, corner of the board or the corner or the door. Even the corner of the computer screen

Multiple Choice

You get your report card from your teacher and what do you see?

• obtuse angle

• right angle

• acute angle

• reflex angle

Reflex angle

• It measures 180-360 degrees

• It can't be less than 180

• It can't be more than 360

• The angle looks backwards

• Example measures: 181,255,199,205,356,288,342,200

Multiple Choice

Which answer choice is not a reflex angle?

• 185 degrees

• 254 degrees

• 179 degrees

• 285 degrees