Learning Intention: Understand that an angle is the amount of turn between two lines (known as arms) that end in a common point (known as the vertex). |
Success Criteria:
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Angles are important in many professions like construction, doctors, hair dressing, and professional sports. We also use knowledge of angles for every day tasks such as giving directions, taking photos or even playing sports.
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What is an angle?
Think, pair, and share with your partner to write your own definition.
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What is an angle?
Think, pair, and share with your partner to write your own definition.
Learning Intention: To be able to measure and classify angles with and without the use of a protractor.
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Success Criteria:
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Learning Intention: To calculate unknown angles on a straight line with and without the use of a protractor.
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Success Criteria:
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Practice with protractors: http://www.abcya.com/measuring_angles.htm
Adjacent angles are two angles that have a common vertex and a common side. The vertex of an angle is the endpoint of the arms that form the sides of the angle. When we say common vertex and common side, we mean that the vertex point and the side are shared by the two angles.
For example, angle ADC is adjacent to angle DBC because...
- They have a common side (DC).
- They have a common vertex (C).
CHALLENGE: what important pattern can you find when cutting and measuring the angles off triangles to form angles on a line?
- They have a common side (DC).
- They have a common vertex (C).
CHALLENGE: what important pattern can you find when cutting and measuring the angles off triangles to form angles on a line?
How can I find the size of this angle without a protractor?
Learning Intention: to measure and be able to find unknown angles around a point. |
Success Criteria:
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Lets explore this further...
- In pairs use the tape to make your own angles on a point.
- Draw the angle in your math book.
- Use a protractor to measure the angles and write the sizes in your math book.
- In pairs use the tape to make your own angles on a point.
- Draw the angle in your math book.
- Use a protractor to measure the angles and write the sizes in your math book.
Learning Intention: to be able to measure and find unknown vertically opposite angles.
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Success Criteria:
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Lets explore this further...
- In pairs use the cardboard to make your own vertically opposite angles.
- Make as many vertically opposite angles as you can, measure, then draw them in your math books.
- In pairs use the cardboard to make your own vertically opposite angles.
- Make as many vertically opposite angles as you can, measure, then draw them in your math books.
Learning Intention: Use angle relationships (rules) to find unknown angles.
Success Criteria:
- I can use angle relationships to find the size of unknown angles.
- I can use addition and subtraction to find the size of unknown angles.
- I can explain and show my working.
- I can write the number sentence using correct symbols.
Learning Intention: to be able to identify line and rotational symmetry of shapes.
Success Criteria:
- To be able to understand that rotational symmetry is how many times a shape fits into itself after a 360 degree rotation.
- To be able to understand that the amount of times a shape fits into itself (rotational symmetry) is called an order.
- To be able to identify the rotational symmetry of shapes.
- To be able to understand that line symmetry is the amount of times a shape can be divided by a line into parts that are mirror images. These parts are called lines of symmetry.
- To be able to identify lines of symmetry in different shapes.
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Rotational Symmetry
A shape has Rotational Symmetry when it still looks the same after a rotation (of less than one full turn). How many times it matches when we go once around is called the Order. If a shape has only 1 order of rotational symmetry then we say that is has no rotational symmetry. |