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

The worksheet, designed for enhancing skills in measuring angles using a protractor, focuses on obtuse angles—those greater than 90 degrees but less than 180 degrees. Students are tasked with measuring three specific angles provided on the sheet, estimating the size of an angle that ends with the digit 5, and using a protractor to measure it accurately. Additionally, they are asked to identify all the obtuse angles in a given figure. This activity aims to develop their proficiency in using a protractor, including understanding how to read both the inside and outside scales, and deciding which one is appropriate for the measurement at hand.

In the reasoning and problem-solving section, students are presented with scenarios where they must identify mistakes made while measuring angles. For example, they might find that a character named Dexter has made an error, and they need to pinpoint what went wrong. Furthermore, they explore different methods of measuring obtuse angles, such as subtracting from 180 degrees or adding up values on the protractor as if it were a number line. Correct placement of the protractor is emphasised, ensuring the 0 line is aligned with one of the angle's arms. Through these exercises, students learn to measure angles with greater fluency and precision, and understand common pitfalls to avoid in the process.