I have two questions:

If a parallelogram is a rhombus, then the diagonals are congruent-
I don't think so in all cases-they can bisect each other and are perpendicular, correct but not necessarily congruent so this should be false?

Secondly, A kite is a quadrilateral that has exactly 2 pairs of consecutive congruent sides-I think this is true?, it can be used as a theorem of kites

Both your answers are correct.

Let's break down both questions and examine the statements:

1. If a parallelogram is a rhombus, then the diagonals are congruent.

To verify whether this statement is true or false, let's examine the properties of parallelograms and rhombuses.
- A parallelogram is a quadrilateral with opposite sides that are parallel.
- A rhombus is a parallelogram with all sides congruent.

One of the properties of a rhombus is that its diagonals bisect each other at a right angle. This means that the diagonals of a rhombus are perpendicular. However, being perpendicular does not imply that the diagonals are necessarily congruent.

Therefore, the statement "If a parallelogram is a rhombus, then the diagonals are congruent" is false, as the diagonals of a rhombus are not always congruent.

2. A kite is a quadrilateral that has exactly 2 pairs of consecutive congruent sides.

To determine if this statement is true or false, we need to understand the properties of kites:
- A kite is a quadrilateral with two pairs of consecutive congruent sides.

By definition, a kite indeed has exactly two pairs of consecutive congruent sides. These pairs may have different lengths, but they are adjacent to each other. So, the statement "A kite is a quadrilateral that has exactly 2 pairs of consecutive congruent sides" is true.

The properties of shapes can vary, so it's always best to understand and evaluate the properties individually to determine the accuracy of statements about them.