The pictured device is called a Sine bar. What features and functions does it have?Select all that applyIs used independently, without any other equipmentsin, cos or tan is used to evaluate the angleCan be used to measure unknown anglesCylinders separated by a known distancePrecision ground cylinders and rectangular bodyIs a practical use of trigonometryCan be used to set precise angles

The Sine bar is a precision instrument used in metalworking to measure angles and to set up work for precise angular cuts. Here are the features and functions of a Sine bar:

1. It is not used independently, but in conjunction with other equipment such as gauge blocks for setting the precise angle.

2. The sine of the angle is used to evaluate the angle. This is done by setting the height of one end of the sine bar using gauge blocks and then measuring the distance between the points of the two precision ground cylinders.

3. It can be used to measure unknown angles. This is done by setting up the workpiece at the unknown angle, and then measuring the height difference between the two ends of the sine bar.

4. The two cylinders are separated by a known distance, which is usually 5 or 10 inches. This distance is used in the calculation of the sine of the angle.

5. The sine bar has precision ground cylinders and a rectangular body. This ensures that the measurements are accurate and repeatable.

6. The sine bar is a practical use of trigonometry. The sine of the angle is calculated using the known distance between the cylinders and the measured height difference between the two ends of the sine bar.

7. It can be used to set precise angles. This is done by calculating the required height difference for the desired angle, and then setting this height difference using gauge blocks.