Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Sec One Express Mathematics ICT Lesson Chapter 7: Angles and Parallel Lines 7.2 Angles A) Angles and Measurements We can measure a corner of Louvre Museum in Paris, France. B A Le us name the angle The unit of angle is degree. C Example: ABC 60 o Sec One Express Mathematics 7.2 Angles B) Types pf Angles ICT Lesson Here are more examples types of angles Complementary angles A C Note: If the sum of two angles adds up to 90o ABC 60 o ABD 30 o B D ABC ABD 60 30 90 o o o Sec One Express Mathematics ICT Lesson WHAT HAVE YOU LEARNT? Let us try this Note: This is a complementary angle where the two angles adds up to 90o x 62 90 o x 90 62 o o o x 28 o Sec One Express Mathematics ICT Lesson WHAT HAVE YOU LEARNT? Let us try this… Sec One Express Mathematics ICT Lesson PROPERTIES OF ANGLES D E Here A B C Sec One Express Mathematics ICT Lesson WHAT HAVE YOU LEARNT? Let us try this AOE EOD DOB 180 o AOE 30 o 90 o 180 o AOE 60 o The sum of adjacent angles on a straight line is 180o. Sec One Express Mathematics ICT Lesson Sum of all angles at a point is 360o Here 63o+ 50o + 75o + 1100 + c = 360o Therefore c = 137o Sum of all angles adds to 360o Sec One Express Mathematics ICT Lesson When two straight lines intersect, the vertically opposite angles are equal. S P POQ SOR 105 POS POR 75 o o o Reason: Vertically opposite angles. Q R Sec One Express Mathematics ICT Lesson WHAT HAVE YOU LEARNT? Sec One Express Mathematics ICT Lesson Activity I Click on the following link to recall the types of angles. http://www.mathsisfun.com/angles.html Ace-Learning Activity • Log on to your Ace-Learning account and follow the instructions Sec One Express Mathematics Content Hub -> Exploratory Activities ICT Lesson Sec One Express Mathematics Exploratory Activities: Geometry -> Complete these 1 Adjacent angles on a straight line 2 Angles at a point 3 Vertically opposite angles ICT Lesson Sec One Express Mathematics ICT Lesson Exploratory Activities: Alternate Angles Explore the following from Ace-learning 1 Adjacent angles on a straight line 2 Angles at a point 3 Vertically opposite angles Follow the activities in this order – Exploration, Understanding & Application! Sec One Express Mathematics HAVE FUN! ICT Lesson