Introducing Angles on a Straight Line

Introducing Angles in a Triangle
Introducing Angles on a Straight Line
Introducing Angles on a Straight Line
Introducing Angles on a Straight Line

What's Included

  • Smart Notebooks Presentation
  • Activ Inspire Flipchart
  • Lesson Plan
  • Microsoft PowerPoint Presentation
  • Differentiated Worksheet

Introducing Angles on a Straight Line

Using angles on a straight line have a sum of 180° students learn how to calculate missing angles and set up and solve simple equations this property.  More able students apply this to recognise and calculate vertically opposite angles.The start of the lesson recaps perpendicular angles.  In the main part students learn how to calculate missing angles on a straight line using the sum of 180°. The plenary challenges students to create a straight line out of three known angles.
Differentiated Learning Objectives
  • All students should be able to know the sum of the angles on a straight line is 180°.
  • Most students should be able to calculate vertically opposite angles and angles on a straight line.
  • Some students should be able to prove that vertically opposite angles are equal.
View online lesson
Lesson Downloads
Download PowerPoint Download Notebook Download Flipchart Download Worksheet
Scheme of Work Link
Angle Properties
Related Blog
Geometrical Reasoning in Key Stage 3
IMMEDIATE DOWNLOAD

Mr Mathematics Blog

Mathematics OFSTED Inspection – The Deep Dive

Earlier this week, my school took part in a trial OFSTED inspection as part of getting ready for the new inspection framework in September 2019. This involved three Lead Inspectors visiting our school over the course of two days. The first day involved a ‘deep dive’ by each of the Lead Inspectors into Mathematics, English […]

How to Solve Quadratics by Factorising

The method of how to solve quadratics by factorising is now part of the foundational knowledge students aiming for higher exam grades are expected to have.   Here is an example of such a question. Solve x2 + 7x – 18 = 0 In my experience of teaching and marking exam papers students often struggle with […]

How Write 3 Part Ratios

When learning how to write 3-part ratios students need to understand how ratios can be made equivalent. The start of the lesson reminds students by asking which of six ratios is the odd one out.  This is presented to the class as they come into the lesson.    Writing Equivalent Ratios  A few students immediately go […]