A: All triangles being equilateral requires all angles to be 60?60 ? . Without specific angle measures, this cannot be confirmed. B: All triangles being isosceles suggests that at least two angles in each triangle are equal. Again, without specific angle measures or side lengths, this cannot be confirmed. C: All triangles being scalene indicates all sides and angles are different. This is also not verifiable without measurements. D: If all angles are 60?60 ? , the triangles might be equilateral. This requires more information to confirm. E: If all angles are 90?90 ? , the triangles would be impossible since a triangle cannot have all right angles. F: The relationships m?BAE=2m?CADm?BAE=2m?CAD and m?CAB=2m?EADm?CAB=2m?EAD suggest specific proportional angle measures; this requires specific values to confirm. G: Similar relationships as option F that would require specific angle measures to verify.

Quadrilateral BCDE is inscribed in a circle with a center at point A. A D E Which statements must be true? Select all that apply