Which statement is not always true for a parallelogram? (a) opposite sides are congruent. (b) diagonals bisect each other. (c) it has 4 congruent angles. (d) consecutive angles are supplementary.

The incorrect statement about the properties of a parallelogram is: It has 4 congruent angles and this can be determined by using the properties of a parallelogram.

A quadrilateral having two pairs of parallel sides is known as the parallelogram.

Properties of a parallelogram are as follows:

Therefore, the incorrect statement is given by option C).

For more information, refer to the link given below:

link

(C) It has 4 congruent angles.

Step-by-step explanation:

A parallelogram is a four sided figure in which opposite sides are equal and parallel.

with is description we ca say that:

The consecutive angle add up to 180°. That means that they are supplementary.

The 4 angles are not congruent.

step-by-step explanation:

given perimeter: 28cm

length: 9cm

atp,

2(l+w)=p of the reactangle

2(9+x)=28

18+2x=28

2x=28-18

x=10/2

x=5

therefore width is 5 cm