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Unit 10: 208Types of lines and angles
10.0 Preliminary activities
Activity 10.0.1
Activity 10.0.3
Activity 10.0.1
10.1 Straight lines
(a) Straight and non closed lines
Activity 10.0.1
Activity 10.1.2
(a) Oblique straight line
(b) Horizontal line.
(c) Two vertical lines.
I have learnt that:
There are 4 types of lines:
• The horizontal straight line
• The vertical straight line
• Oblique straight line towards right
• Oblique straight line towards left.
Activity 10.1.3
(b) Closed lines
Activity 10.1.4
Activity 10.1.5
a) a zigzag closed line
b) a closed line
I have learnt that:
A closed line is a line which is not open.
(c) Non straight open lines
Activity 10.1.6
Activity 10.1.7
a) Left open line
b) Top open line
I have learnt:
An open line is a non closed line
Application activity 10.1
(d) Curved lines
Activity 10.1.8
Activity 10.1.9
a) A zigzag line
b)A curved down open line
Activity 10.1.10
I have learnt that:
– Curved lines are non straight lines.
– Zigzag lines are lines made by line segments of different directions.
10.2 Types of angles
(a) Right angle
Activity 10.2 1
Activity 10.2.2
I have learnt that:
A right angle is an angle formed by two intersecting straight lines: the horizontal and the vertical lines
Activity 10.2.3
(b) Acute angle
Activity 10.2.4
I have learnt that:
An acute angle is an angle made by two intersecting straight lines; one of them is oblique and this angle is less than the right angle.
Activity 10.2.5
(c) Obtuse angle
Activity 10. 2.6
Activity 10. 2.7
a) Two oblique lines
b) Horizontal lines and an oblique line.
I have learnt that:
An obtuse angle is greater than a right angle, it is made of:
- Two oblique lines or
- A vertical line and an oblique line
- A horizontal line and an oblique line
Activity 10. 2.8
Application activities 10.2
(d) Comparing right angle, obtuse angle and the acute angle
Activity 10.2.9
I have learnt that:
– A right angle is greater than an acute angle
– An obtuse angle is greater than a right angle
– An obtuse angle is greater than an acute angle
– An acute angle is less that a right angle
– An acute angle is less than an obtuse angle.
END UNIT ASSESSMENT 10
2. Answer by Yes or No
(a) An obtuse angle is greater than a right angle
(b) An obtuse angle is less than an acute angle
(c) A right angle is greater than an acute angle
3. Draw
(a) A right angle
(b) A closed line
(c) An oblique straight towards the right
(d) An obtuse angle
(e) A vertical straight line
(f) An acute angle
g) A horizontal straight line