Problem 538.
Triangle, Perpendicular Bisector, Circumcircle, Midpoint, Intersection of a Line with a Circle.

Problem 532.
Triangle, Circumcircle, Equal Angles, Perpendicular, Area, Intersection of a Line with a Circle.

Problem 530.
Cyclic Quadrilateral, Diagonal, Diameter, Perpendicular, Congruence, Intersection of a Line with a Circle.

Problem 529.
Right Trapezoid, Circle, Diameter, Intersection of a Line with a Circle.

Problem 527.
Circle, Tangent, Secant, Chord, Midpoint, Measurement, Intersection of a Line with a Circle.

Problem 526.
Equilateral Triangle, Circumcircle, Chord, Measurement, Intersection of a Line with a Circle.

Problem 525.
Circles, Diameter, Tangent, Radius, Congruence, Measurement, Intersection of a Line with a Circle.

Problem 522.
Right Triangle, Circle, Diameter, Tangent, Intersection of a Line with a Circle.

Problem 500.
Circle, Diameter, Chord, Perpendicular, Measure, Intersection of a Line with a Circle.

Problem 493.
Right Triangle, Circumcircle, Perpendicular, Chord, Intersection of a Line with a Circle.