Which button on a function generator is used to change a sine wave to a square wave?

In the context of a function generator, the correct choice involves identifying the button used to alter the waveform type produced by the generator. The waveform button is designed specifically for selecting different types of waveforms, such as sine, square, triangle, and sawtooth. By pressing the waveform button, you can toggle between these options, allowing you to change a sine wave to a square wave.

The other buttons serve different functionalities; for instance, the phase shift button adjusts the phase of the output waveform, while the frequency button modifies the frequency of the waveform currently being generated. The option that suggests a 'shave tree button' does not correspond to any standard function found on typical function generators, indicating it's not a relevant choice in this context. Therefore, the waveform button is indeed the appropriate selection for switching between sine and square waves.