Can someone help me ok this question

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

Cole says the distance between points (-5,0) and (0,-5)is 5 units. is he correct? explain why or why not.

An isosceles trapezoid with a perimeter of 42 inches. each of the congruent non parallel sides is 5 inches long, and the trapezoid is 3 inches tall. how long are the two parallel sides? a. 10 in, 22 in b. 16 in, 16 in c. 10 in, 16 in d. 12 in, 20 in