19 feet!
The circumference is 59.66 feet.
The circumference of a 19 foot diameter circle is: 59.7 feet.
Feet is the plural term for foot. So 19 feet = 19 feet.
283.529 sq. ft., assuming 19' diameter: A = pi * radius2 = pi * (19 / 2)2.
8' x 19' = 152 square feet.
Using 3.14 as Pi the area of circle is: 283.385
19 feet = 5.8 metres.
1 foot 7 inches
Well, isn't that a happy little question! Blackboards come in all different sizes, so there's no one answer to that. Some blackboards might be a few feet wide, while others could be much larger. Just remember, it's not about the size of the blackboard, it's about the creativity you bring to it.
1 foot = 12 inches therefore 19 feet = 228 inches
19