If someone could pls me with this and show the work that would be great : ))

The center of the circumscribed circle lies on line segment and the longest side of the triangle is equal to the of the circle.

Points a, b, and c form a triangle. complete the statements to prove that the sum of the interior angles of triangle abc is 180

2people are trying different phones to see which one has the better talk time. chatlong has an average of 18 hours with a standard deviation of 2 hours and talk-a-lot has an average of 20 hours with a standard deviation of 3. the two people who tested their phones both got 20 hours of use on their phones. for the z-scores i got 1 for the chatlong company and 0 for talk-a-lot. what is the percentile for each z-score?