1. The problem asks to fill in the blanks in the statement about the area of a parallelogram and the area of a circle. 2. The area of a parallelogram is calculated by multiplying the base by the height. This means the area is the **product** of the base and the height. 3. Similarly, the area of a circle is given by the formula $$\pi r^2$$, which is the **product** of $$\pi r$$ and $$r$$. 4. Therefore, the correct answer is that the area of a parallelogram is the **product** of the base and height, and the area of a circle is the **product** of $$\pi r$$ and $$r$$. Final answer: **C. product, product**