If the diameter of a circle is 4, what is the radius? 4 2π 4π 2 2. Multiple Choice 2 mins 1 pt If r = 4, d = ? 4 2 8 8π 3. Multiple Choice 2 mins 1 pt If d = 3, r = ? 6 3 1.5 1 4. Multiple Choice 3 mins 1 pt Find the circumference of the circ...