How is the diameter of a circle related to the distance around a circle

Combined megan and kelly worked 60 hours.kelly worked twice as many hours as megan.how many hours did they each worked?

Consider that lines b and c are parallel. what is the value of x? what is the measure of the smaller angle?

The figure below shows rectangle abcd and the triangle eca on a coordinate plane.which of the following expressions represents the perimeter of triangle of triangle eca in units