• Free Printable Protractor
• Best Free Protractor App

A screen protractor for your computer

Developed for the Yahoo! Widget Engine, Protractor is a small widget that provides you with a simple tool for measuring angles and circles, directly from your desktop.

PROTRACTOR With this app you can even convert your measurements to degrees and radians. This is a great all around app and can be useful in many different situations in life. Everything works as you would expect in a normal protractor app. Download Protractor+ and enjoy it on your iPhone, iPad, and iPod touch. ‎Protractor helps you to measure angles quickly and easily. This app turn your iPhone into a handy pocket protractor that can measure angles in both degrees and radians. Connect With Github Connect With Twitter Ads Free Download our Android app for Protractor interview questions (Interview Mocks ) Support us by disabling your adblocker. Advertisements help us provide users like you 1000's of technical questions & answers, algorithmic codes and programming examples.

It can be used by math students for upcoming geometry projects, for instance. The app is easy to install and set up, regardless of the user's experience level.

The interface of the tool is based on a large, transparent frame that you can move to any position on the screen, with the help of the mouse cursor.

By opening the context menu, you can set the relative rotation, angle marker and compass deviation. Additional settings are available in the Widget Preferences screen. For instance, you can also mark the zero degree.

Regarding the frame's appearance, you can adjust the protractor's size, background and compass opacity, as well as establish the background size, angle marker color, compass style (default, four-point, eight-point) and colors. Thanks to the default options provided by the Yahoo! Widget Engine, you may also make the frame stay on top or below all the other windows.

The lightweight tool barely uses CPU and system memory, so it doesn't put a strain on the computer's overall performance. It has a good response time and works well, without causing the operating system to hang, crash or display error notifications; we haven't encountered any issues throughout our testing. All in all, Protractor is a very reliable tool for measuring circles and angles in a virtual environment.

Filed under

Free Printable Protractor

Protractor 1.4

runs on:

Windows All

file size:

141 KB

main category:

Windows Widgets

developer:

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This activity allows manipulation and investigation of various types of angles. The online protractor tool can be used to practice measuring angles. It can be used at a variety of different grade levels. At its most basic for teaching about types of angles, acute, obtuse or reflex. For more advanced use to create angle problems in which the missing letter angle values have to be found. You can click and drag the handles to change the angles and the values will updated.

The controls

Best Free Protractor App

• The mode control is used to it selects the type of angle problem.
• Next to this is number of lines. But please note this control is disabled for both 'one' and 'intersect' modes.
• the random button sets each angle to a random value
• the equals button make all the angles equal.
• the Protractor button when clicked will show or hide a protractor
• Paper can select spots, squares or none for the background.
• Use the angles display to choose whether to show or hide angles

In all the modes individual angles can be shown or hidden for example click the angle (a). Notice when the value is hidden the angle value next to the angle arc is replaced by the corresponding letter.

The handles at the end of each line can be clicked and dragged to change the angle.

Mode 'one' Identifying angle types.

The initial mode is unique in that there is only one angle. This mode is great for identifying various types of angles. Click the angle type ctrl to either show or hide the type. So now you can change the angle by dragging a handle or clicking dice for a random value. The angle types definitions are listed in the glossary below.

Complementary Angles mode

In this mode a complementary angle is shown, complementary angles add up to 90° Initially the 90° is split by just one line but this can be changed by selecting a different number of lines. A standard school problem is to have one missing angle that needs to be calculated. You can produce infinite such problems by selecting calculate from angles display, now press dice for a new problem.

Supplementary Angles mode

Supplementary angles are angles that add up to 180°. This mode behaves exactly the same as the previous.

Angles at a point mode

The angles at a point add up to 360°. In this mode press = button to make all the angles equal. This can be good way to start a problem followed by small adjustments to the lines by dragging.

Angles at intersecting lines mode

The final mode deals with angles produced by an intersection of two lines. If you have selected calculate you will notice that only one angle is given and all the other 3 can be worked out using the vertically opposite rule, or spotting the supplementary angles.

Angles Glossary

Acute Angle

Any angle that is less than 90°

Right Angle

An angle that is 90°

Obtuse Angle

An angle greater than 90° but less than 180°

Straight Angle

An angle of 180° which makes a straight line

Reflex Angle

An angle greater than 180°

Related activities

The interactive clock angles activity can also be used in explaining angles.