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  • GETIntPhaseMaths display tagshide tags

    This module is included inLens: Siyavula: Mathematics (Gr. 4-6)
    By: Siyavula

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Recognising and describing angles

Module by: Siyavula Uploaders. E-mail the author

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MATHEMATICS

Geometry

Volume

EDUCATOR SECTION

Memorandum

Do you remember what the word parallel means? Write down the definition for it:

Invariable

1. A: Yes

B: Yes

2. C

1.

1.1 Obtuse

1.2 Right angle

1.3 Rotation

1.4 Acute

BRAIN-TEASER!

1. Acute

Obtuse

Straight

Right angle

2. Class discussion:

LEANER SECTION

Content

Do you remember what the word parallel means? Write down the definition for it:

_____________________________________________________________________

_____________________________________________________________________

_____________________________________________________________________

Let's begin with some "puzzles"!

Look at the sketches below and answer the questions that follow:

Figure 1
Figure 1 (graphics1.png)

1. Indicate whether EF and GH are parallel to one another in figure

A: __________________________________________________________________

B: __________________________________________________________________

2. Which is the extension of F: C or K?

Figure 2
Figure 2 (graphics2.png)

Do you still remember?

Table 1
graphics3.png indicates a line: AB
graphics4.png indicates a line segment: EF
graphics5.png indicates a radius: CD

Two lines that intersect form an angle.

Figure 3
Figure 3 (graphics6.png)

The point where the lines meet is called the vertex.

We write this as: ÐABC

  • Did you know?

The unit that we use for measuring angles is a degree. We measure

the size of the angle in degrees. We write an angle of 60 degrees as 60°.

You have to learn the different types of angles:

Table 2
Types of angles
1. The size of a rotation or full turn is 360° graphics7.png
2. A straight angle is a half turn and it is 180°. graphics8.png
3. A right angle is a quarter turn and it is 90°. graphics9.png
4. An acute angle is larger that 0°, but smaller than 90°. graphics10.png
5. An obtuse angle is larger than 90°, but smaller than 180°. graphics11.png

ACTIVITY: Recognising and describing angles [LO 4.11]

1. How well do you know angles?

Work with a partner to see if the two of you can tell what the following angles are:

Table 3
graphics12.png1.1
_________________________________
graphics13.png1.2
_________________________________
graphics14.png1.3
_________________________________
graphics15.png1.4
_________________________________

Assessment

Learning Outcome 4:The learner will be able to use appropriate measuring units, instruments and formulae in a variety of contexts.

Assessment Standard 4.11: We know this when the learner recognises and describes angles in two-dimensional shapes, three-dimensional objects and the environment.

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Lenses

A lens is a custom view of the content in the repository. You can think of it as a fancy kind of list that will let you see content through the eyes of organizations and people you trust.

What is in a lens?

Lens makers point to materials (modules and collections), creating a guide that includes their own comments and descriptive tags about the content.

Who can create a lens?

Any individual member, a community, or a respected organization.

What are tags? tag icon

Tags are descriptors added by lens makers to help label content, attaching a vocabulary that is meaningful in the context of the lens.

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