If angles A, B, C and D of the quadrilateral ABCD, taken in order are in the ratio 3 : 7 : 6 : 4, then ABCD is a

If angle A, angle B, angle C and angle D of a quadrilateral ABCD, taken in order, are in the ratio 3:7:6:4 then ABCD is a

In a quadrilateral ABCD, angles A, B, C and D are in the ratio 3:2:1:4 Prove that AD is parallel to BC.

The angles A, B,C, D of a quadrilateral ABCD are in the ratio 1:2:4:5. Consider the following statements : 1. ABCD is a cyclic quadrilateral. 2. sin (B - A) = cos (D - C). Which of the above statements is/are correct ?

The angles A, B,C, D of a quadrilateral ABCD are in the ratio 1:2:4:5. What is cos (A + B) equal to ?

The angles A, B,C, D of a quadrilateral ABCD are in the ratio 1:2:4:5. What is cosec (C - D + B) equal to ?

The angles A, B,C, D of a quadrilateral ABCD are in the ratio 1:2:4:5. What is sec^(2)D - tan^(2)D equal to?