Making Rotating Arms (Activity - Page 25)

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Making Rotating Arms (Activity - Page 25)Objective: To help students understand how angles are formed, how they vary, and how to compare them, using a hands-on tool made from everyday materials. Materials Needed: 2 paper straws (or sticks, skewers, pencils — anything lightweight and straight) 1 paper clip (the kind you can unfold slightly to make a pivot point) Steps to Make the Tool: Step 1: Take the 2 paper straws. These will act as the arms of the angle. Step 2: Insert both straws into the arms of the paper clip. This lets them rotate around a common point — like rays sharing the same vertex. You now have a working angle model: The straws are rays The joint is the vertex The space between the straws is the angle Activity – What Students Should Do 1. Rotate the arms to form different angles: Acute (less than 90°) Right (exactly 90°) Obtuse (more than 90° and less than 180°) 2. Compare angles: Create several different angles with different pairs of straws. Use superimposition (place one rotating arm set over another) to compare which angle is larger or smaller. Let’s look at two more activities using these rotating arms