E2.4 Identify angles and classify them as right, straight, acute, or obtuse.
Activity 1: Right, Acute, Obtuse and Straight Angles
Task 1: Guided Learning
Material
- GeoStix
- brass paper fasteners
Instructions
Give students GeoStix and brass paper fasteners. Have them build:
- a right angle, and then collect the angles created;
- an angle smaller than a right angle, then collect the angles created (introduce the term “acute angle”);
- an angle greater than a right angle, and then collect the angles created (introduce the term “obtuse angle”;
- an angle formed by two adjacent right angles, then collect the angles created (introduce the term “straight angle”).
Task 2: Independent Learning
Material
- Geoboard
- rubber bands
On a geoboard, students construct right, acute, obtuse, and straight angles.
Students show their angles to the rest of the class and explain what they did.
Task 3: Group Learning
Material
- Magazines, newspapers, brochures, catalogs, scissors, glue stick, dark marker, large cardboard or bristol board
Instructions
In teams of two or three, students cut out representations of objects from a magazine or brochure that show right, acute, obtuse, and straight angles.
Students trace the angles with a marker.
Students glue the pictures onto a large cardboard or bristol board.
Students write the name of each angle underneath.
Students show their poster to the rest of the class.
Task 4: Independent Learning
Material
- Worksheet with a drawing prepared by the teacher
The teacher prepares a drawing of all the types of angles seen in class. Students write the type of angle beside each drawing.
Source: translated from L’@telier - Ressources pédagogiques en ligne (atelier.on.ca).
Activity 2: Finding Angles on Objects
Find objects with right, acute, obtuse or straight angles in the classroom, schoolyard, home, bedroom, etcetera.
Bring them to class or make a list to present to the class.
Cut out 10 pictures of objects with angles from a catalog, flyer or magazine, glue them onto lined paper and trace the angles on them with a marker.
Note: Students can also create a drawing using software and identify the angles.
Bring the work to present to the class.
Source: translated from L’@telier - Ressources pédagogiques en ligne (atelier.on.ca).
Activity 3: What Angle Is This?
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
What angles are in the letters of your name?
0 1 2 3 4 5 6 7 8 9
What angles are in the numbers?
Source: translated from L’@telier - Ressources pédagogiques en ligne (atelier.on.ca).