This smart protractor let you take a picture with camera or from gallery, and then with the triangle, measure angles and lengths relative to the reference line. Features: - Measure angles in Degrees or Radians - Measure lengths relative to reference - Measure area relative to reference - Take pictures - Open existing image - Save and send measurements - High precision zoom view - Easy to use</br></br></br></br></br></br></br></br></br></br>