Measuring Angles with a Protractor

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Objective

I can use a protractor to measure angles in degrees.

Part 1 of 3

Warm-up video

Whats Up Dude · 3:43

We don't generate video — this one is by Whats Up Dude on YouTube. The practice questions and exit ticket below were drafted by AI for this objective, and every question is editable in the teacher guide.

Part 2 of 3

Practice

7 questions

1

What is the name of the line on a protractor that goes from 0° to 180°? What is its purpose when measuring angles?

2

Imagine you are measuring an angle and you've lined up one side of the angle with the baseline of the protractor. The other side of the angle lines up halfway between the 50° mark and the 60° mark. What is the measurement of the angle?

Part 3 of 3

Exit ticket

Quick comprehension check

An angle has one side lined up with the 0° mark on the left side of the protractor's baseline. The other side of the angle lines up with the 30° mark on the outer numbers. What is the measurement of the angle? An angle has one side lined up with the 0° mark on the right side of the protractor's baseline. The other side of the angle lines up with the 110° mark on the inner numbers. What is the measurement of the angle?

Sample answer included in the free materials

Get the materials

Teacher guide, student handout, and slides — free, in Google Docs format

  • Teacher Guide

    Complete lesson plan with answer keys and alternate activities

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