Explanation -
1. Initial Volume of the Cylinder:
The volume V of a cylinder is given by the formula: V = πr2h
where r is the radius of the base and h is the height of the cylinder.
- Change in Diameter:
The diameter is reduced by 3331% .
This fraction in decimal form is:
3331%=33.3333%=31
Therefore, the new diameter is:
new diameter = original diameter ×(1−31)
= original diameter × 2/3
Since the radius is half of the diameter, the new radius rnew is:
rnew = new diameter / 2 = (original diameter × 2/3 ) / 2 = r × 2/3
- Change in Height:
The height is doubled, so the new height hnew is: hnew = 2h
- New Volume of the Cylinder:
Substituting the new radius and height into the volume formula, we get:
Vnew = π(rnew)2hnew=π(r×32)2(2h)
Simplify the equation:
Vnew=π(32)2r2×2h
= π94r2×2h=π98r2h
Thus, the new volume Vnew is:
Vnew = 8/9 V
where V is the original volume.
- Percentage Change in Volume:
The percentage change in volume is given by:
Percentage change =(VVnew−V)×100%
Substituting Vnew = 8/9 V :
Percentage change =(V98V−V)×100%
= (V98V−99V)×100%
Percentage change} = (V98V−99V)×100%
= (V−91V)×100%
Percentage change} = −91×100%
= - 100/9 % = −1191%
So, the volume of the cylinder decreases by 1191% .
Therefore, the correct answer is Decrease by 1191 percent.