Class 1: Angles Class 2: Parallel lines and angles
Author : min-jolicoeur | Published Date : 2025-05-12
Description: Class 1 Angles Class 2 Parallel lines and angles Class 3 Quadrilaterals and types of triangles Class 4 Congruent triangles Class 5 Theorems 1 4 Class 6 Theorems 5 6 Class 8 Theorem 8 Class 9 Theorem 9 Class 10 Theorem 10 Menu
Presentation Embed Code
Download Presentation
Download
Presentation The PPT/PDF document
"Class 1: Angles Class 2: Parallel lines and angles" is the property of its rightful owner.
Permission is granted to download and print the materials on this website for personal, non-commercial use only,
and to display it on your personal computer provided you do not modify the materials and that you retain all
copyright notices contained in the materials. By downloading content from our website, you accept the terms of
this agreement.
Transcript:Class 1: Angles Class 2: Parallel lines and angles:
Class 1: Angles Class 2: Parallel lines and angles Class 3: Quadrilaterals and types of triangles. Class 4: Congruent triangles. Class 5: Theorems 1- 4 Class 6: Theorems 5 & 6 Class 8: Theorem 8 Class 9: Theorem 9 Class 10: Theorem 10 Menu Select the class required then click mouse key to view class. Class 7: Theorem 7 and the three deductions.(Two classes is advised) Angles An angle is formed when two lines meet. The size of the angle measures the amount of space between the lines. In the diagram the lines ba and bc are called the ‘arms’ of the angle, and the point ‘b’ at which they meet is called the ‘vertex’ of the angle. An angle is denoted by the symbol .An angle can be named in one of the three ways: 1. Three letters Using three letters, with the centre at the vertex. The angle is now referred to as : abc or cba. 2. A number Putting a number at the vertex of the angle. The angle is now referred to as 1. 3. A capital letter Putting a capital letter at the vertex of the angle. The angle is now referred to as B. Right angle A quarter of a revolution is called a right angle. Therefore a right angle is 90. Straight angle A half a revolution or two right angles makes a straight angle. A straight angle is 180. Measuring angles Acute, Obtuse and reflex Angles Any angle that is less than 90 is called an acute angle. An angle that is greater than 90 but less than 180 is called an obtuse angle. An angle greater than 180 is called a reflex angle. Angles on a straight line Angles on a straight line add up to 180. A + B = 180 . Angles at a point Angles at a point add up to 360. A+ B + C + D + E = 360 Pairs of lines: Consider the lines L and K : Intersecting Parallel lines L is parallel to K Written: LK Parallel lines never meet and are usually indicated by arrows. Parallel lines always remain the same distance apart. Perpendicular L is perpendicular to K Written: L K Now work on practical examples in your maths book. Parallel lines and Angles 1.Vertically opposite angles When two straight lines cross, four angles are formed. The two angles
