The top of the page says - When two chords of a circle intersect, the measure of the angle formed at their intersection will always be the average of the arc measures formed by the endpoints of the chords.
This relationship in the diagram below is represented in the formulas that follow... can someone do it for me please

Grace is a 70-year old woman who paid the utility bill online for the first time. she called her bank's customer service center to make sure she had done the transaction successfully. but the voice recording repeatedly played a message that all representatives were busy, which irked grace. which factor would make grace not recommend the bank to others? a. absence of technology b. lack of accessibility c. lack of financial products d. poor reputation