Need formulas could you use to find the volume of a right circular cone? (a.) v=b*h where b=l*w (b.) v=3b*h where b=pi r^2 (c.) v=1/3b*h where b=l*w (d.) v= 1/3 b*h where b=pi r^2

A right circular cone has a circle as its base.
All answers that have B = l * w cannot be correct as that is the area of a rectangle, not a circle.
The area of a circle is A = pi  r^2, so you need B = pi r^2 in the formula.

The only formula that is correct is choice D. V = 1/3 Bh, where B = pi r^2

11/2.2 = 5 inches for the length 8.5/2.2= 3.86 inches for the width