Schedar (Alpha Cassiopeiae) is a giant star, and its size is considerably larger than our Sun. Here's what we know:

* Radius: Schedar's radius is approximately 20 times larger than the Sun's radius.

* Volume: This means Schedar's volume is 8,000 times larger than the Sun's volume.

However, it's important to note:

* Direct measurement is difficult: Determining the exact size of stars is challenging. Astronomers use various methods, including measuring its brightness and temperature, to estimate its size.

* Stellar size varies: Stars come in many sizes, and even within a specific class (like giants), there can be a significant range in size.

So, while Schedar is a large star, its exact size could be slightly different than the estimated 20 times the Sun's radius.