Introducing Angles in a Triangle

Introducing Angles in a Triangle
Introducing Angles in a Triangle
Introducing Angles in a Triangle
Introducing Angles in a Triangle

              Introducing Angles in a Triangle

              Building on angles on a straight line and vertically opposite angles students are taught why angles in a triangle have a sum of 180°.  More able students are challenged to prove this using angles in parallel lines.The start of the lesson recaps related angle properties such as those on a straight line and about a point.  The main part introduces the sum of angles in a triangle as 180° and provides several examples for practice.  The plenary challenges students to combine multiple properties within a single problem.
              Differentiated Learning Objectives
              • All students should be able to calculate angles in a scalene triangle.
              • Most students should be able to calculate angles in an isosceles triangle and combine other angle properties.
              • Some students should be able to prove angles in a triangle have a sum of 180°.
              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

              Problem Solving – Numerical Methods

              Students are challenged to apply the rules of arithmetic to a series of real-life, functional problems.

              Problem Solving with Averages

              Students are challenged to apply their understanding of the mean, mode, median and range to calculate datasets by setting up and solving equations.

              Problem Solving with Compound Percentages

              Five, real-life and functional problem solving questions on compound percentage changes.