Properties of Shape - Measure with a Protractor (2) - Presentation

In this engaging lesson on measuring angles, students will delve deeper into the use of a protractor, with a specific focus on obtuse angles. The lesson begins with an interactive discussion, prompting students to define and recognise an obtuse angle. They are then presented with a series of activities that require them to estimate the size of various angles before using a protractor to measure them accurately to the nearest degree. To ensure a comprehensive understanding, students are tasked with identifying obtuse angles within different shapes and images, estimating their sizes, and then confirming their estimations through precise measurements.

The lesson also incorporates reasoning tasks to challenge students' critical thinking skills. For instance, they are asked to identify errors in angle measurement, such as incorrectly aligning the protractor. Various strategies are explored for finding the value of an angle, including subtraction and addition methods, as well as the correct placement of the protractor. Independent work tasks further reinforce the learning objectives, where students must measure angles, identify and correct mistakes, and articulate their reasoning. Interactive discussions throughout the lesson encourage students to articulate how they determine if an angle is obtuse and the importance of proper protractor placement, enhancing their overall understanding of measuring angles with a protractor.