2015 · Q60
ABCD is a parallelogram, where AB : AD = 2:1. One of the angles of the parallelogram is 60°. The two diagonals are in the ratio
Elementary MathematicsQuadrilaterals and Polygons
- A7 : 3
- B{7}:{3}
- C7 : 5
- DNone of the above
Explanation
With sides 2 and 1 and included angle 60°, the diagonals are √(4+1−2·2·1·cos60°) = √3 and √(4+1+2·2·1·cos60°) = √7; ratio √7:√3 (option B).