In circle M with the measure of arc LN= 74°, find m

Which of the following statement about pascal's triangle are true?

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

The bolo cavern outside of vandalia is 421 ft below sea level. a little more than75 miles away. mt owens is 7295 feet above sea level. what is the difference in elevation between the bolo cavern and mt owens?