Daniela is a stain glass artist; she created the window below for her living room. what is the area of the window she created?

The window has a shape of a semi-circle (half of a circle).

We know the diameter d = 12 ft.

The area of a (complete) circle is given by the formula:
A = π × r²

The radius can be found by halving the diameter:
r = d ÷ 2
  = 12 ÷ 2
  = 6 ft

Therefore the area of the circle will be:
A = π × r²
    = 3.14 × 6²
    = 3.14 × 36
    = 113.04 ft²

And the area of the semi-circle:
A = 113.04 ÷ 2
   = 56.52 ft²

Hence, the area of the window will be 56.52 ft².