slide for elementary school

1. Mathematics
Primary 5

2. Objectives
At the end of the lesson, I should be able to:
a. Identify the instruments in a mathematical set
b. Use these instruments to construct lines and angles

3. The Mathematical Set
In the mathematical set there are:
1. The Set Square: for drawing perpendicular and parallel lines
2. The Ruler: for measuring lengths and joining points
3. The Compass: for constructing angles, triangles, circles etc.
4. The Protractor: for measuring angles
5. The Pencil: for construction

4. DEFINITION OFTERMS
Lines: A line is the distance between two point a line can be a thin or thick mark that
can also be short or long. It has length but no breath. A line can be straight, curved,
wavy or zigzag
TYPES OF LINES
1. Perpendicular lines
2. Horizontal lines
3. Vertical lines
4. Parallel lines
5. Transversal lines
6. Oblique lines

5. Types of Lines
• PERPENDICULAR LINES
These are two straight lines which
meet to form a right angle triangle or
cross each other at right angle
• HORIZONTAL LINES
These are straight line that run from
east to west

6. Types of Lines
• VERTICAL LINES
These are numbers that stand
upright or cross the horizontal line at
900
• PARALLEL LINES
These are straight lines that never
meet, however far they are drawn

7. Types of Lines
• TRANSVERSAL LINES
These are straight lines which cut two
or more parallel lines.
• OBLIQUE LINES
These are straight slanting lines that
meet horizontal lines forming angles
that are less or more than 900

8. Types of Angles
• Right angle: this is an angle that is equal to 900 .
• Acute angle: this is an angle that is less than 900
• Obtuse angle: this is an angle that is more than 900,but less than 1800
• Straight angle: this is an angle on a straight line. It is 1800
• Reflex angle: this is an angle that is more than 1800 but less than 3600
• Complementary angle: these are angles which have the total of 900
• Supplementary angle: these are angles which have a total of 1800
• Angle at a point: these are angles which have a total of 3600
• Complete turn or revolution: an angle that is 3600

9. Construction of angle 600 ,900 AND 450