# Tetrahedron

Calculate height and volume of a regular tetrahedron whose edge has a length 18 cm.

**Result****Leave us a comment of example and its solution (i.e. if it is still somewhat unclear...):**

**Showing 0 comments:**

**Be the first to comment!**

#### To solve this example are needed these knowledge from mathematics:

## Next similar examples:

- Cube corners

From cube of edge 14 cm cut off all vertices so that each cutting plane intersects the edges 1 cm from the nearest vertice. How many edges will have this body? - Theorem prove

We want to prove the sentense: If the natural number n is divisible by six, then n is divisible by three. From what assumption we started? - Average

If the average(arithmetic mean) of three numbers x,y,z is 50. What is the average of there numbers (3x +10), (3y +10), (3z+10) ? - Teams

How many ways can divide 16 players into two teams of 8 member? - Blocks

There are 9 interactive basic building blocks of an organization. How many two-blocks combinations are there? - Chords

How many 4-tones chords (chord = at the same time sounding different tones) is possible to play within 7 tones? - AP - simple

Determine the first nine elements of sequence if a10 = -1 and d = 4 - Trigonometry

Is true equality? ? - PIN - codes

How many five-digit PIN - code can we create using the even numbers? - Legs

Cancer has 5 pairs of legs. The insect has 6 legs. 60 animals have a total of 500 legs. How much more are cancers than insects? - Line

It is true that the lines that do not intersect are parallel? - Sequence

Write the first 7 members of an arithmetic sequence: a_{1}=-3, d=6. - Confectionery

The village markets have 5 kinds of sweets, one weighs 31 grams. How many different ways a customer can buy 1.519 kg sweets. - Sequence 2

Write the first 5 members of an arithmetic sequence a_{11}=-14, d=-1 - Elimination method

Solve system of linear equations by elimination method: 5/2x + 3/5y= 4/15 1/2x + 2/5y= 2/15 - Three workshops

There are 2743 people working in three workshops. In the second workshop works 140 people more than in the first and in third works 4.2 times more than the second one. How many people work in each workshop? - Three unknowns

Solve the system of linear equations with three unknowns: A + B + C = 14 B - A - C = 4 2A - B + C = 0