Final answer:
To calculate the mass of the circle, we need to know the density of the cardboard material. Once we have the density, we can use the formula m = V × d, where V is the volume of the circle and d is the density.
Step-by-step explanation:
To calculate the mass of a circle made of cardboard, we need to know the density of the cardboard material. Let's assume the density is d g/cm³.
The volume of a circle is given by V = πr², where r is the radius of the circle.
Since the radius is 8.0 cm, the volume would be V = π(8.0 cm)² = 64π cm³.
The mass of the circle can be calculated using the formula m = V × d.
Therefore, the mass would be m = 64π cm³ × d g/cm³.