What is the area of a regular octagon with a side length of 5.8 centimeters and an apothem length of 7 centimeters?

In the diagram, the measure of angle 9 is 85° which angle must also measure 85°?

Aperpendicular bisector, cd is drawn through point con ab if the coordinates of point a are (-3, 2) and the coordinates of point b are (7,6), the x-intercept of cd is point lies on cd.

10 points? me . its important ‼️‼️