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How do you find the volume of a cone with diameter 10 cm and height 7 cm?

To determine the volume of a cone, we can use the formula:

V=13πr2hV = \frac{1}{3} \pi r^2 h

In this equation, VV represents the volume of the cone, rr is the radius of the base, and hh is the height of the cone.

For this particular problem, we are provided with the diameter of the cone’s base, which measures 10 cm. To find the radius, we divide the diameter by 2. Thus, the radius rr can be calculated as follows:

r=102=5 cmr = \frac{10}{2} = 5 \text{ cm}

Additionally, the height hh of the cone is given as 7 cm.

Now, we can substitute these values into the volume formula:

V=13π(5)2(7)V = \frac{1}{3} \pi (5)^2 (7)

To solve this, we first calculate the radius squared:

52=255^2 = 25

Next, we multiply this result by the height:

25×7=17525 \times 7 = 175

Then, we multiply by π\pi:

175π175 \pi

Finally, we divide this product by 3 to find the volume:

V=175π3V = \frac{175 \pi}{3}

Using the approximate value of π3.14\pi \approx 3.14, we can estimate the volume as follows:

V175×3.143V \approx \frac{175 \times 3.14}{3}

Calculating the numerator:

175×3.14=549.5175 \times 3.14 = 549.5

Now, we divide this by 3:

V549.53183.17 cm3V \approx \frac{549.5}{3} \approx 183.17 \text{ cm}^3

Therefore, the volume of the cone is approximately 183.17183.17 cubic centimeters.

Answered by: Prof. Alan Smith
A-Level Physics Tutor
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