Identify the geometric shapes and any given measurements in the image.

Analysis of Geometric Elements:

• The image displays a circle with center point O.
• Points A, B, and C are located on the circumference of the circle.
• Line segments are drawn connecting O to A, O to B, and O to C, indicating radii.
• Line segments are also drawn connecting A to B and A to C, forming chords.
• An angle is indicated with its vertex at O, subtended by the arc AC. The measure of this angle is given as 170°.
• Another angle is indicated with its vertex at B, subtended by the arc AC. This angle is marked with the variable x.

The geometric shapes present are a circle and triangles (formed by the radii and chords). The given measurements are an angle of 170° and an unknown angle 'x'.