Q:
# What is a quadrilateral with congruent diagonals?

**A quadrilateral with congruent diagonals is a rectangle or a square.** All four angles of a rectangle and a square are right angles, making the diagonals congruent. The diagonals of a rectangle and a square also bisect each other.

Rectangles and squares are parallelograms with both pairs of opposite sides parallel and equal. The area of a rectangle is given by A=length x width and the perimeter is given by P=2(length+ width).

A square has four equal sides. The area of a square is given by A=side x side, or side squared. The perimeter of a square is given by P= 4 x length of the side of the square.

The opposite angles of a rectangle are also congruent. Any two consecutive angles of a rectangle and a square are supplementary: their measures add up to 180 degrees. Every square is a rectangle but not every rectangle is a square.

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Q:
## What quadrilateral has perpendicular diagonals?

A: The quadrilaterals that have perpendicular diagonals are "square," "rhombus" and "kite." A quadrilateral is a closed two-dimensional figure containing four... Full Answer >Filed Under: -
Q:
## How many diagonals does a triangle have?

A: A triangle has zero diagonals. Diagonals must be created across vertices in a polygon, but the vertices must not be adjacent to one another. A triangle has... Full Answer >Filed Under: -
Q:
## How many diagonals does a nonagon have?

A: A nonagon, or enneagon, is a polygon with nine sides and nine vertices, and it has 27 distinct diagonals. The formula for determining the number of diagona... Full Answer >Filed Under: -
Q:
## How many diagonals does a decagon have?

A: A decagon has 35 diagonals regardless of whether it is a regular or irregular polygon. This can be determined by using a simple formula that applies to pol... Full Answer >Filed Under: