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To calculate the square footage, multiply the length by the breadth. So, 10 feet x 8 feet = 80 square feet
Area of a circle is pi*radius^2. So if the radius is measured in feet, the area (or the square footage) of a half circle is: (pi*r^2)/2
you use the formula: Pi x radius (half the diameter) squared.
Multiply the length by the width. i.e. 10' wide x 25' long... has an area of 250 sq. ft.
To find the square footage of a rectangle, you multiply the length by the width. In this case, the area is 10 feet by 5 feet, so the square footage would be 10 ft x 5 ft = 50 square feet.