2013 · Q54
Consider the following statements:
- 1ABCD is a cyclic quadrilateral.
- 2sin(B−A) = cos(D−C).
Which of the above statements is/are correct?
Elementary MathematicsGeometry
- A1 only
- B2 only
- CBoth 1 and 2
- DNeither 1 nor 2
Explanation
A+B+C+D=360° but A+C≠180°, so not cyclic; 2 also false. Answer D.