Calculating the volume of a cylinder - GMAT Quantitative

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What is the volume of a cone with a radius of 6 and a height of 7?

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The only tricky part here is remembering the formula for the volume of a cone. If you don't remember the formula for the volume of a cone, you can derive it from the volume of a cylinder. The volume of a cone is simply 1/3 the volume of the cylinder. Then,

volume = $\frac{pi $r^{2}$$h}{3} = $\frac{picdot $6^{2}$$cdot 7}{3} = 84pi

What is the volume of a sphere with a radius of 9?

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volume = $\frac{4}{3}$pi $r^{3}$ = $\frac{4}{3}$pitimes $9^{3}$ = 972pi

What is the volume of a cylinder that is 12 inches high and has a radius of 6 inches?

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$volume=\pi $r^{2}$h=\pi $6^{2}$12=432\pi$

A cylindrical gas tank is 30 meters high and has a radius of 10 meters. How much oil can the tank hold?

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$V=\pi $r^{2}$h=\pi $(10^{2}$)30=3000\pi$

The height and the circumference of a cone are equal. The radius of the cone is 6 inches. Give the volume of the cone.

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The circumference of a circle with radius 6 inches is $2 \pi \cdot 6 = 12 \pi$ inches, making this the height. The area of the circular base is $B = \pi \cdot $6^{2}$ = 36 \pi$ square inches. The cone has volume

$V = $\frac{1}{3}$ Bh = $\frac{1}{3}$ \cdot 36 \pi \cdot 12 \pi = 144 \pi ^{2}$ cubic inches.

The height of a cylinder is twice the circumference of its base. The radius of the base is 10 inches. What is the volume of the cylinder?

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The radius of the base is 10 inches, so its circumference is $2 \pi$ times this, or $2 \pi \cdot 10 = 20 \pi$ inches. The height is twice this, or $40 \pi$ inches.

Substitute $r = 10 , h = 40 \pi$ in the formula for the volume of the cylinder:

$V = \pi r ^{2} h$

$V = \pi \cdot 10 ^{2}\cdot 40 \pi = 4,000 \pi ^{2}$ cubic inches

A large cylinder has a height of 5 meters and a radius of 2 meters. What is the volume of the cylinder?

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We are given the height and radius of the cylinder, which is all we need to calculate its volume. Using the formula for the volume of a cylinder, we plug in the given values to find our solution:

$V=\pi $r^2h$$

$V=\pi $(2)^2$(5)$

$V=20\pi$

Consider the Circle :

(Figure not drawn to scale.)

Suppose Circle is the base of a cylindrical silo that has a height of . What is the volume of the silo in meters cubed?

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To find the volume of cylinder, use the following equation:

$\small V=\pi $r^2h$$

In this equation, is the radius of the base and is the height of the cylinder. Plug in the given value for the height of the silo and simplify to get the answer in meters cubed:

$\small \small V=\pi $(15:m)^2$*30:m=6750 $\pi:m^3$$

A given cylinder has a radius of and a height of . What is the volume of the cylinder?

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The volume of a cylinder with radius and height is defined as $V=\pi $r^{2}$h$ . Plugging in our given values:

$V=\pi $r^{2}$h$

$V=\pi $(10)^{2}$(15)$

$V=\pi (100)(15)$

$V=1500\pi$

A cylindrical oil drum has a radius of meters and a height of meters. How much oil can the drum hold?

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Since we are looking to find out how much oil the drum can hold, we need to find the volume of the drum. The volume of a cylinder with radius and height is defined as $V=\pi $r^{2}$h$ . Plugging in our given values:

$V=\pi $r^{2}$h$

$V=\pi $(2m)^{2}$(3m)$

$V=\pi $(4m^{2}$)(3m)$

$V=12\pi $m^{3}$$

Daisy has an empty cylindrical water bottle that has a radius of and a height of . How much water can she add to the bottle to fill it up?

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Since we are looking to find out how much water the bottle can hold, we need to find the volume of the bottle. The volume of a cylinder with radius and height is defined as $V=\pi $r^{2}$h$ . Plugging in our given values:

$V=\pi $(3cm)^{2}$(15cm)$

$V=\pi $(9cm^{2}$)(15cm)$

$V=135\pi $cm^{3}$$

Find the volume of a cylinder whose height is and radius is .

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To find the volume of a cylinder, you must use the following equation:

Thus,

Find the volume of a cylinder whose height is and radius is .

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To find the volume, you must use the following formula.

Find the volume of a cylinder whose diameter is and height is .

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To solve, you must use the following equation:

, given and . Thus,

The height of a cylinder is $\pi ^{x}$ ; its bases are circles with radius $\pi$ .

Give the volume of the cylinder.

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The volume of a cylinder can be calculated from its radius and height as follows:

$V = \pi r ^{2} h$

Setting $h = \pi ^{x}$ and $r = \pi$ .

$V = \pi \cdot \pi ^{2} \cdot \pi ^{x} = $\pi^{1}$ \cdot \pi ^{2} \cdot \pi ^{x} = \pi ^{1+2+x} = \pi ^{x+3}$

A right circular cylinder has bases of radius $\pi ^{x}$ ; its height is $\pi ^{y}$ . Give its volume.

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The volume of a cylinder can be calculated from its radius and height as follows:

$V = \pi r ^{2} h$

Setting $r = $\pi^{x}$$ and $h = \pi ^{x}$ :

$V = \pi \cdot $(\pi^{x}$) ^{2} \cdot $\pi^{y}$$

$V = $\pi^{1}$ \cdot $\pi^{2 x}$ \cdot $\pi^{y}$$

$V = $\pi^{1+2 x+y}$$ or $V = $\pi^{2 x+y+1}$$

What is the volume of a cone with a radius of 6 and a height of 7?

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The only tricky part here is remembering the formula for the volume of a cone. If you don't remember the formula for the volume of a cone, you can derive it from the volume of a cylinder. The volume of a cone is simply 1/3 the volume of the cylinder. Then,

volume = $\frac{pi $r^{2}$$h}{3} = $\frac{picdot $6^{2}$$cdot 7}{3} = 84pi

What is the volume of a sphere with a radius of 9?

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volume = $\frac{4}{3}$pi $r^{3}$ = $\frac{4}{3}$pitimes $9^{3}$ = 972pi

What is the volume of a cylinder that is 12 inches high and has a radius of 6 inches?

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$volume=\pi $r^{2}$h=\pi $6^{2}$12=432\pi$

A cylindrical gas tank is 30 meters high and has a radius of 10 meters. How much oil can the tank hold?

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$V=\pi $r^{2}$h=\pi $(10^{2}$)30=3000\pi$