Geometrical construction of lines involves the use of lines and angles to depict a shape or an object.
A Line is a mark or stroke long in proportion to its breadth, made with a pen, pencil, tool, etc on a surface.
A line can also be defined as a long thin mark made by a pen, pencil, marker, etc.
Types of angles:
· Acute Angle: This is an angle less than 90º
· Obtuse Angle: this angle is greater than 90º but not more than 180º
· Reflex Angle: this angle is greater than 180º but not more than 360º
· Right Angle: this is angle 90º
· Angle on a straight line: the angle is 180º. It is also referred to as ‘straight angle’.
· Angle that makes a revolution: the angle is 360º or angle around a point. It is full rotation.
· Complementary angles are two angles with the sum of 90º
· Supplementary angles are two angles with the sum of 180º
1. What does geometrical construction of lines involve?
2. What is a line?
3. Outline and clearly describe 5 different types of angles.
4. Outline the differences between acute, Obtuse and Reflex angles.
5. Why is 180° called a straight angle?
6. Differentiate between complimentary angles and supplementary angles.