Find the areas of the circles with dimensions given below.

1. Radius: $4$ ft

   Hint (a):

   Area $= πr^{2}$

2. Diameter: $0.6$ cm

   Hint (b):

   Area $= πr^{2}$

   Step 1(b):

   $r=\frac{\text{diameter}}{2}=\frac{0.6\text{cm}}{2}=0.3\text{cm}$

   Step 2(b):

   $A = π\left(0.3 \text{ cm}\right)^{2}$

   Answer (b):

   Approximately $0.2826$ sq cm