# ResMath Measuring Angles Using Protractor

- Author:
- Julia D'Anna, Anthony OR 柯志明

## PART 1: Practice using a protractor!

- Click and drag on the
**protractor to move it.** - Click and drag on the
**red dot to turn it.** **Line the protractor on the angle.**Do you see the angle's measure?**Check the Answer box**to show your angle's measure.- Click and drag the
**green dots on the angle to change its size.**

## PART 2: Make a right angle!

A right angle is 90 . The corner of a book or a piece of paper or the places where the lines cross on a plus sign are examples (+)

**Use the green dots to make this angle****90****.**Check your work using the protractor.## PART 3: Make an acute angle!

An acute angle is 1-89 . A slice of pie or an inequality symbol are examples of acute angles (><).

**Use the green dots to make an acute angle below.**Check your work using the protractor.## PART 4: Make an obtuse angle!

An obtuse angle is 91-179 . The roof of a house or the edges of a stop sign are examples of obtuse angles.

**Use the green dots to make an obtuse angle below.**Check your work using the protractor.