Volume of a Cylinder Using the Diameter

[Marklek]

You didn't use diameter. You calculated the radius from the diameter and plugged it into the radius formula. To the formula with diameter, you do
D = 2r, so r = D/2
V = (D/2)^2 * pi * h
(D/2)^2 = (D^2)/4
therefore,
V = (D^2)/4 * pi * h,
or cleaner,
V = (D^2 * pi * h)/4

[anwn]

Why is this recommended when I search up how to find the volume of a cylinder without the height?

[zaythevibe]

How would we know when we use the diameter or do we always use it when our radius is even?

[chelsealacey]

For R (5) did he just cut 2R (10) in half?
Do you do that for all of them or just this equation?

[jhomelmatola]

It is Okay Not To Multiplied the PI Within it?

[matthewellison]

The earth is 7926.28 miles wide in diameter and its circumference is 24, 901.55 miles. North America is 1, 582 miles wide. South America From Lima, Peru, to Fortaleza, Brazil: 2, 705 miles (4, 353 km). Africa is 4, 355 miles (7, 009 km) from Dakar, Senegal, east to Mogadishu, Somalia. Asia is 5, 465 miles (8, 795 km) wide. The Atlantic's width varies from 2, 848 kilometres (1, 770 mi) between Brazil and Sierra Leone to over 6, 400 km (4, 000 mi) in the far-south. And the Pacific ocean reaches its greatest east-west width at about 5°N latitude, where it stretches approximately 19, 800 kilometres (12, 300 mi) from Indonesia to the coast of Colombia and Peru – halfway across the world, and more than five times the diameter of the Moon. Antartica is 5, 100, 000 sq miles. Why is that UN.??? Does that = a flat earth.??

[alexisgonzalez]

Thank You so much!!!! I struggle in math and tgis just helped so

[AmazingAJ-htdq]

WHY SO
someone plz answer this
The base of a cylinder has a radius of 5 cm. What is its area?

[michaelatencio]

Charlie, what happens when radius is 1"? The math doesn't work because 1x1=1 yet I have a 2" diameter piece of pvc. How does it work when using 1 doesn't work? I'm trying to determine volume for a 2" piece of PVC. I need 56 cu in minimum

The formula I'm using is: 3.1416 x 2" (r squared) x 9" (height) = 56.5488 cu in is this correct?

[tiffanymichelle]

Thanks for the help I’m studying for a read exam and this was a question it

[Tauralidin]

every thing I looked up is so confusing, just trim all the BS with D2 X .7854 X H