Please need help evaluate the math problems

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

Angle xyz is formed by segments xy and yz on the coordinate grid below: a coordinate plane is shown. angle xyz has endpoints at 3 comma negative 1 and 6 negative 2 and 3 comma negative 3 and measures 36.87 degrees. angle xyz is rotated 270 degrees counterclockwise about the origin to form angle x′y′z′. which statement shows the measure of angle x′y′z′?

Look at triangle wxy what is the length (in centimeters) of the side wy of the triangle?