Can you solve this puzzle? Small SBD for answer. by pandasquad

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puzzle · @pandasquad · Jan 17 '18

$0.94

Can you solve this puzzle? Small SBD for answer.

The surface area of a spherical ball measured in square centimetres (cm^2) is the same as its volume, measured in cubic cm (cm^3).

What is the diameter of the ball?

https://archive.cnx.org/resources/e6b7f849f6a0479e74b88990d6bade50fcdea8c6/CNX_BMath_Figure_09_06_015.jpg

This is a bit of as maths one really.

There is a grand prize of 0.003 SBD for the winner and two 0.001 SBD runner up prizes.

The winner is the first correct answer. After 7 days the runners up will be randomly selected. I will use a random number generator and assign numbers to all correct answers and the two chosen will win (It's a small prize but mainly just for fun.)

Please optionally upvote if you like this post or give an answer, have fun!

I usually, but not always, get voting bots on my posts after a few days to allow people to earn curation rewards.

👍 melip, drotto, cryptohappenings, mrzurkon, pandasquad

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@drotto · Jan 18 '18

<p>This post has received a 2.35 % upvote from @drotto thanks to: @pandasquad.</p>

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@pandasquad · Jan 24 '18 (edited)

$0.04

This is a maths problem really, solved by V=S.

So (4/3)π(r^3) = 4π(r^2)

r^2 can be cancelled from both sides to give:

(4/3)πr = 4π

Then there is only one variable that can be separated by dividing both sides by 4π to give:

(1/3)r = 1

Then times both sides by three to give r=3.

Diameter is equal to 2r as @uber-dragon mentioned so diameter =6.


So no winners here, I've learnt my lesson and will do easier problems :P

👍 pandasquad, superexplorer, mrzurkon, scoobyscoobydoo, galifrey

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@uber-dragon · Jan 17 '18

The diameter is 2r

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