The graph below depicts both expressions. 
The desired area is equal to 4 times the area of the red triangle.
The area of the red triangle is calculated using the formula: \[ \text{Area} = \frac{1}{2} \times \text{base} \times \text{height} \] Given the values, we compute: \[ \text{Area} = \frac{1}{2} \times 1 \times 1 = \frac{1}{2} \text{ square units} \]
Therefore, the required area is: \[ 4 \times \frac{1}{2} = 2 \text{ square units} \]
Final Answer: \( \boxed{2} \) square units
Two circles, each of radius 4 cm, touch externally. Each of these two circles is touched externally by a third circle. If these three circles have a common tangent, then the radius of the third circle, in cm, is