The diagonals of a parallelogram PQRS are along the lines x + 3y = 4 and 6x – 2y = 7. Then PQRS must be
Rectangle
Parallelogram
Cyclic quadrilateral
Rhombus
As product of slope of these two lines is –1, hence these diagonals are perpendicular. So, PQRS must be a rhombus.
PQRS is a parallelogram, if the two diagonals are equal, then the measure of DPQR is: