Which quadrilaterals have

a)perpendicular diagonals
b)opposite angles congruent?
c) two pairs of parallel sides?
d) a pair of congruent, adjacent sides?

My answers
a)rhombus and square
b)rhombus, square, and parallelogram
c)parallelogram, rectangle, and square
d) at first I thought it was a kite, but kite has 2 pairs of congruent adjacent sides so this answer would be a general quadrilateral with 2 sides congruent.

Am I correct or did I forget something?

Rectangle

Your answers are mostly correct. Here's a breakdown of each question and the correct answers:

a) Quadrilaterals with perpendicular diagonals: The rhombus and square have perpendicular diagonals. In both shapes, the diagonals bisect each other at right angles.

b) Quadrilaterals with opposite angles congruent: You are correct that the rhombus, square, and parallelogram have opposite angles congruent. This means that the opposite pairs of angles within these shapes are equal in measure.

c) Quadrilaterals with two pairs of parallel sides: The parallelogram, rectangle, and square have two pairs of parallel sides. In a parallelogram, both pairs of opposite sides are parallel. In a rectangle, all angles are right angles, and in a square, all sides are equal in length, making them special types of parallelograms.

d) Quadrilaterals with a pair of congruent, adjacent sides: Your initial thought of a kite is incorrect. A kite has two pairs of congruent adjacent sides but does not have a pair of congruent, adjacent sides. The correct answer is a trapezoid, which has one pair of parallel sides and a pair of adjacent sides that are congruent.

So, to recap:
a) Rhombus and square
b) Rhombus, square, and parallelogram
c) Parallelogram, rectangle, and square
d) Trapezoid

You did a great job overall, and your answers were mostly correct.

Your answers are mostly correct. Here is the revised and complete response:

a) Quadrilaterals with perpendicular diagonals are:
- Rhombus
- Square

b) Quadrilaterals with opposite angles congruent are:
- Rhombus
- Square
- Parallelogram
- Rectangle

c) Quadrilaterals with two pairs of parallel sides are:
- Parallelogram
- Rectangle
- Square
- Trapezoid (In some cases, not all sides are parallel)

d) Quadrilaterals with a pair of congruent, adjacent sides:
- Rhombus
- Square
- Rectangle
- Isosceles Trapezoid (Only the legs are congruent. The bases may or may not be congruent.)

So, in summary:
a) Perpendicular diagonals: Rhombus and Square
b) Opposite angles congruent: Rhombus, Square, Parallelogram, Rectangle
c) Two pairs of parallel sides: Parallelogram, Rectangle, Square, Trapezoid
d) A pair of congruent, adjacent sides: Rhombus, Square, Rectangle, Isosceles Trapezoid