Rectangle with Diagonal
Rectangles are quadrilaterals with four right angles and opposite sides that are equal in length. A diagonal is a line segment that connects two non-adjacent vertices of a polygon. In a rectangle, the diagonal is a line segment that connects opposite corners of the rectangle.

Properties of a Rectangle
- Opposite sides of a rectangle are equal in length
- Opposite angles of a rectangle are equal
- Diagonals of a rectangle are equal in length and bisect each other
- The sum of the interior angles of a rectangle is always 360 degrees

Picture of Rectangle with Diagonal
Now, let's visualize a rectangle with a diagonal. In the image below, we have a rectangle ABCD with diagonal AC.
In the image, you can see that the diagonal AC divides the rectangle into two congruent right triangles, triangle ABC and triangle ADC. The diagonal AC is also equal in length to the length of the rectangle's longer side.

Importance of Diagonals in Rectangles
Diagonals play a crucial role in rectangles as they help in determining the properties of the rectangle. They divide the rectangle into congruent triangles and provide a visual representation of the rectangle's symmetry and proportions.
In conclusion, understanding the concept of rectangles and diagonals, along with their properties, is essential in geometry. Visualizing a rectangle with a diagonal can help in grasping the concept better and applying it to solve geometric problems effectively.