9. x = 9 units
10.
11.
12.x =10 units
13. x= 1 unit
14.
15.
16.
Explanation:
9.
Opposite sides of a parallelogram are equal to each other.
Therefore
2x-5 = 13
⇔2x = 13+5
⇔
⇔x = 9 units
10.
Sum of adjacent angles of parallelogram is
.
Therefore
⇔
⇔
⇔
⇔
11.
Opposite angles of a parallelogram are congruent(equal).
Therefore
⇔
⇔
⇔
12.
Opposite sides of a parallelogram are congruent.
Therefore
2x-11=9
⇔2x = 11+9
⇔2x=20
⇔
⇔x =10 units
13.
Opposite sides of a parallelogram are congruent (equal).
Therefore,
17x+1=18
⇔17x =18-1
⇔x= 1 unit
14.
Opposite angles of a parallelogram are congruent(equal).
Therefore,
⇔
⇔
⇔
15.
Sum of adjacent angles of parallelogram is
.
Therefore
⇔
⇔
⇔
16.
Opposite angles of a parallelogram are congruent(equal).
Therefore,
⇔
⇔
⇔