With this simple half-disc virtual protractor application you can easily find approximate measure of angle in degrees. 
Start the application and point camera at the angle. The protractor overlay will help you estimate the measure of angles.

*Important notice:
Use the information recoded in (or generated with) this application only as a rough indication, rough estimates or as a rough guide. Even though we do our best to provide you with confirmed information, the accuracy is NOT GUARANTEED by us. Users are strongly advised to confirm the information of their interest with other sources. This application is provided “as is” and with all faults. You bear the risk of using it. We shall not be responsible or liable for any loss or damage of any kind incurred as a result of the use of functions or the content of this application. By using this application you are agreeing to these terms. If you do not agree to these terms do not use this application.