Measuring Angles - 4th grade

Measuring Angles - 4th Grade

Recap from last week

Vertex

Ray

• a part of a line with one endpoint

• Where two rays meet

Poll

Have we ever seen this?

• Yes

• No

Draw

Please draw a Ray

Draw

Please draw a vertex

Open Ended

Tell me what you know about a protractor, there are no wrong answers

Delicious!

​What is a protractor?

A protractor is a tool we use in math to measure angles. It looks like this!

Multiple Choice

What angle does this measure?

• 130

• 140

• 150

• 175

Multiple Choice

What angle does this measure?

• I don’t know

• 120

• 60

• 90

Time to put your thinking cap on.
This one’s tricky

Multiple Choice

Which of the angles measures 145 degrees?

• A

• B

​Moving on to angle types!

This angle is less than 90°, this angle is very small

Acute angle

This angle often looks like the letter L. This will be the only angle with a square.

Right angle

Obtuse Angle

An obtuse angle is an angle that is greater than 90°, this angle is big.

This angle is a straight line, it measures 180°.

​

Straight angle

Categorize

Options (4)

Greater greater than 90 degrees

Less than 90 degrees

180 degrees, straight line

Equal to 90 degrees

Drag the corresponding angles into the correct category

Acute

Obtuse

Straight

Right

Time for Kahoot