triangles don't have volume or diameter, so I'm not sure what you're trying to ask.
Volume = 1/3*pi*202*12 = 5026.548 cubic feet (to 3 decimal places)
The area of triangle is : 12.0
Area = 1/2*12*14 = 84 square feet
24 ft2
113.1 square feet.
I got: 2,712.96 cubed.
Volume = 1/3*pi*202*12 = 5026.548 cubic feet (to 3 decimal places)
The area is 78ft2
The area is 120ft2
Volume = 2,111.15026 ft3
The area of triangle is : 12.0
Volume of a pyramid = 1/3*base area*height
Area = 1/2*12*14 = 84 square feet
24 ft2
113.1 square feet.
113.1 square feet.
113.1 square feet.