What fraction is between 1/2 and 1

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

In the diagram of circle o, what is the measure of zabc?

Which of the following is equal to the square root of the cube root of 5 ? (1 point) 5 to the power of 1 over 3 5 to the power of 1 over 6 5 to the power of 2 over 3 5 to the power of 3 over 2