What is the area semi-circle piece of glass for Norman glass when the width is 3ft. and the length is 4ft? Radius is not known.

To find the area of a semicircle, we need to know the radius of the circle. However, in this case, we don't have the radius given directly. But, we can still calculate the radius using the width and length of the rectangle.

Here's how you can calculate the radius and find the area of the semicircle:

1. Start by finding the diameter of the circle. Since the rectangle's width is 3ft and its length is 4ft, we can assume that the diameter of the circle is equal to the length of the rectangle, which is 4ft.

2. Divide the diameter by 2 to get the radius. In this case, the radius will be 4ft ÷ 2 = 2ft.

3. Now that we have the radius, we can calculate the area of the semicircle. The formula to calculate the area of a semicircle is:

Area = (π * r^2) / 2

where π (pi) is a mathematical constant approximately equal to 3.14159 and r is the radius.

4. Plug in the value of the radius we obtained in step 2 (2ft) into the formula:

Area = (π * 2^2) / 2
Area = (π * 4) / 2
Area = 2π

So, the area of the semicircle piece of glass for Norman glass, with a width of 3ft and length of 4ft, is 2π square feet or approximately 6.28318 square feet.