Measuring Angles with a Protractor

The video tutorial explains the correct way to use a protractor for measuring angles. It highlights a common mistake made by Ruth, who fails to align the angle lines properly on the protractor. The tutorial demonstrates the correct method, emphasizing the importance of having one line of the angle along the bottom of the protractor and ensuring the rays meet at the center point. This ensures an accurate measurement, which in the example given, is 128 degrees.

What is Ruth trying to do with the protractor?

• Measure an angle

• Draw a straight line

• Draw a circle

• Measure a length

Why is Ruth's method of using the protractor incorrect?

• She is holding it upside down

• She is not aligning any line with the bottom

• She is using the wrong side of the protractor

• She is measuring the wrong angle

What is crucial for accurate angle measurement with a protractor?

• Aligning one line of the angle with the top of the protractor

• Aligning the protractor with the edge of the paper

• Aligning one line of the angle with the bottom of the protractor

• Aligning both lines of the angle with the sides of the protractor

Where should the two rays of the angle meet on the protractor?

• At the center point

• At the top edge

• At the bottom edge

• At the left side

What is the correct angle measurement in the example given?

• 90°

• 128°

• 45°

• 180°