1. Show that the bisectors of angles of a parallelogram form a rectangle. 2. If a triangle and a parallelogram lie on the same base and between the same parallels, then prove that the area of the triangle is equal to half of the area of parallelogram.

3. iron rods a, b, c, d, e and fare making a design in a bridge shown in the figure. If a parallel to b, c parallel to d, e parallel to f, find the marked angles between

1) b and c

ii) d and e

i) d and f

iv) c and f

question no 3 answer option is in pic