1. Word cloud
120 seconds
What is the name of the figure that has three sides and three angles?
2. Slide
60 seconds
Recognise right angles, angles on a straight line and angles at a point Identify the vertex and arms of angles formed by intersecting lines Identify angle types formed by the intersection
Learning objective:
3. Slide
60 seconds
An angle is the space between two lines or the corner of a shape. Angles are measured in degrees. Common angles are right angles (90°), acute angles (less than 90°) and obtuse angles (more than 90°). Angles are used in everyday life to measure distances and build shapes.
What are Angles?
4. Slide
60 seconds
Angle: A figure formed by two lines or rays that start at the same point and go in different directions. Acute Angle: An angle that measures less than 90 degrees but more than 0 degrees. Obtuse Angle: An angle that measures more than 90 degrees but less than 180 degrees. Right Angle: An angle that measures exactly 90 degrees. Reflex angle: An angle that measures more than 180 degrees but less than 360 degrees. Revolution: An angle that measures exactly 360 degrees.
Concepts:
5. Slide
60 seconds
Angles can be measured in degrees. The angle of a straight line is 180 degrees. The angles of a triangle always add up to 180 degrees.
Did you know?
6. Open question
180 seconds
Work together in pairs: What is the name of the angle formed when two lines intersect at the same point?
7. Slide
60 seconds
Answer
An angle formed when two lines intersect at the same point is called a "vertex angle". Let's discuss why..
8. Drawings
1260 seconds
Question: What are some real life examples of right angles, angles on a straight line and at a point? Clues: • Look around the school and find examples of objects that have right angles. • Think about objects that have a straight line and how that line could create an angle or several angles. • Look at the corner of a table, chair, or other object and see if the corner creates an angle. • Right angles can be found in buildings, furniture, and even toys. Angles on a straight line can be seen in roads, lines, and paths. • Angles at a point can be seen in the corners of walls, in the petals of a flower, or in the tire of a car. In pairs: Select and solve one of the tasks: A. Draw a picture of a real life example of a right angle, angle on a straight line and at a point. B. Share your drawing with the class and explain why each object meets the criteria.
9. Drawings
450 seconds
Brain break: Draw a monkey carrying a banana umbrella and wearing swimming goggles
10. Open question
210 seconds
11. Slide
60 seconds
Angles on a straight line
Angles on a straight line relate to the sum of angles that can be arranged together so that they form a straight line. Angles on a straight line add to 180°.
12. Slide
60 seconds
Right angles on a line
We know that a right angle is equal to 90 degrees. This can help us find the measurement for other angles on a straight line by subtracting 90 degrees from 180 to find what the sum of the remaining angles will be.
13. Open question
240 seconds
Open questions activity
What do you notice about the angles in this image? Can you identify the vertex and arms of the angles that intersect?
14. Slide
60 seconds
Properties of an angle
You would have noticed that the intersecting angles can share the same arms and vertex.
15. Slide
60 seconds
Intersecting angles
When two lines intersect, like the blades of a pair of scissors, a number of angle pairs are formed. You can find relationships between the measures of the angles in each pair.
16. Slide
60 seconds
In your book
Using a straightedge, draw a pair of intersecting lines like the open scissors. Label the angles formed as 1, 2, 3, and 4. For example Use a protractor to measure each angle. What do you notice?
17. Slide
60 seconds
Angles at a point: Revolution
What do you already know about an angle of revolution? How can this knowledge help you identify the size of each of these angles?
18. Open question
180 seconds
Work with a partner: Can you identify the vertex and arms of angles formed by intersecting lines in this image?
19. Drawings
450 seconds
Draw three angles that intersect and identify the vertex and the arms of the angles.
20. Word cloud
120 seconds
Angles vocabulary
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