Why does the Audi R8 use a V10 engine instead of a V8?

I've noticed the Audi R8 uses a V10 engine in most models, while other sports cars typically use a V8. What is the reasoning behind this decision and how does it affect the performance of the car?

The decision to use a V10 engine in the Audi R8 was based on the desire to create a more powerful and high-performance supercar. By using a larger engine, Audi was able to achieve a higher horsepower and overall performance.