1. Finding the Angle of a Leaning Structure or Object
6th grade and upper elementary
Michelle Klepper
Laura Zoromski

2. Angles
An angle is the space measured between two intersecting lines or rays.
There are three types of angles: acute, right, obtuse.
An angle is measured in degrees.
The tool used to measure angles is a protractor.

3. Examples of Angles
Angle
Angle
Angle
Angle
Angle
Angle
Angle

4. Acute Angle An acute angle measures less than 90.
It has the smallest area between the two intersecting lines or rays.

5. Right Angle A right angle measures 90.
A square is used to show a right angle.

6. Obtuse Angle An obtuse angle measures more than 90.
An obtuse angle will not be larger than 180.
It has the largest area between the two intersecting lines or rays.

7. Protractor
A protractor is the tool used to measure angles.

8. Degrees
Degrees is the type of measurement that we use to measure angles.
Degrees is shown by the symbol .
75 is read seventy-five degrees.

9. Leaning What does leaning mean? Leaning is the opposite of straight.
A leaning structure or object will either be an acute angle or an obtuse angle.
A right angle does not lean. It points straight up, down, left, or right.

10. Leaning Tower of Pisa
Is the Tower of Pisa an example of an acute, right, or obtuse angle?
What is the measure of the angle?

11. Church of Suurhusen
Is the Church of Suurhusen an example of an acute, right, or obtuse angle?
What is the measure of the angle?

12. Leaning Tomb Stones
Is the leaning tomb stone an example of an acute, right, or obtuse angle?
What is the measure of the angle?

13. Rose Is the rose an example of an acute, right, or obtuse angle?
What is the measure of the angle?

14. Mountain
Is the mountain an example of an acute, right, or obtuse angle?
What is the measure of the angle?

15. Your Turn With your group, find angles around the school.
Take a picture of your group with each angle.
You must have at least three examples of each type of angle: acute, right, obtuse.
Once the pictures have been printed, be ready to measure the angles.

16. Rubric Identify- to find and name
Advanced
Proficient
Partially Proficient
Unsatisfactory
Identifying and classifying angles: acute, right, obtuse
Angles were identified and classified with 100% accuracy.
Angles were identified and classified with 77%-88% accuracy.
Angles were identified and classified with 66% accuracy.
Angles were identified and classified with less than 66% accuracy.
Measurement with a Protractor
Angles have been measured with 100% accuracy.
Angles have been measured with 77%-88% accuracy.
Angles have been measured with 66% accuracy.
Angles have been measured with less than 66% accuracy.
Identify- to find and name
Classify- arrange (to put) persons, places, or things into groups by similar
characteristics