# Tetrahedron

### Tetrahedron

Hi everyone!

I'm working on a project which has a tetrahedron shape. As shown in the picture below - I have the amout of a, and need to figure out b. I had a look at google, but didn't find the formula to do that. I am completely lost!!! Does anyone have any idea how to calculate b...?

Many many thanks,
Sarah

Spiral

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### Re: Tetrahedron

You have to find the height of the tetrahedron and b is 2/3 of it according to these formulas median formulas.
You have to find the height of sides using Pythagoras' theorem$$= \sqrt{a^2 - \frac{a^2}{4} } = \frac{a\sqrt{3} }{2}$$

Math Tutor

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### Re: Tetrahedron

Math Tutor

Posts: 413
Joined: Sun Oct 09, 2005 11:37 am
Reputation: 30

### Re: Tetrahedron

You have to find the height of the tetrahedron and b is 2/3 of it according to these formulas median formulas.

sajid121

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