Could you guys help me?

What are the values of each variable in the diagram below?

One astronomical unit (1 au) is about 1.496 alt tag missing. kilometers. if you wrote this number of kilometers in regular decimal notation (for example, 528 and 3,459 are written in regular decimal notation), how many zeros would your number have?

The area of a circle is equal to 1 dm². find the radius of the circle.