4. Sphere \( A \) has radius 2 cm . Sphere \( B \) has radius cm. Calculate the volume of each sphere.

To find the volume of a sphere, you can use the formula: \[ V = \frac{4}{3} \pi r^3 \] For Sphere \( A \) with a radius of 2 cm: \[ V_A = \frac{4}{3} \pi (2)^3 = \frac{4}{3} \pi (8) = \frac{32}{3} \pi \approx 33.51 \text{ cm}^3 \] Now, for Sphere \( B \), if you want to find its volume, you’ll need the radius (which seems to be missing in your question). Just substitute the radius of Sphere \( B \) into the same formula to calculate its volume! Sphere volumes are not just numbers; they represent the amount of space inside them! For instance, these volumes can help in real-world situations, like determining how much paint is required to cover spherical surfaces or how many balloons are needed for a party when you know their sizes. Having a clear understanding of volume calculations can make planning events or projects easier and more visual!