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proof for calculation of a Piramid

I always get the question why must i divide by 3 or multiply by ⅓ to calculate the volume of a pyramid. I made a paper model but it cant stay together , so I've made a model with its cubed case so it can hold itself together. and it looks…

Downloads: 15
Likes: 1
Rating: 0

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PrintablesJeremio

Sound visualisation with laser

this is an instrument for making sound vibration visible. it does it by vibrating a membrane made of balloon. on top op the balloon there is a mirror attached. at the other side there is a small laser pointer, that can be turned on by…

Downloads: 11
Likes: 1
Rating: 0

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