What is the area of a rectangle with length 10 and width 5?

To find the area of a rectangle, you multiply the length by the width. In this case, you have a rectangle with a length of 10 units and a width of 5 units.

Using the formula for the area of a rectangle:

Area = Length × Width

Substituting the given values:

Area = 10 × 5 = 50 square units.

Thus, the area of the rectangle is 50 square units, making it the correct choice. This aligns perfectly with the properties of rectilinear shapes, where the area is always calculated as the product of its sides. Understanding this concept is crucial in geometry, as it applies to various practical and theoretical problems involving shapes.