Calculate height and volume of a regular tetrahedron whose edge has a length 19 cm.
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?
- Add vector
Given that P = (5, 8) and Q = (6, 9), find the component form and magnitude of vector PQ.
- 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?
It is true that the lines that do not intersect are parallel?
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 a11=-14, d=-1
- AP - simple
Determine the first nine elements of sequence if a10 = -1 and d = 4
The class is 21 students. How many ways can choose two to examination?
Write the first 6 members of these sequence: a1 = 5 a2 = 7 an+2 = an+1 +2 an
There are 9 interactive basic building blocks of an organization. How many two-blocks combinations are there?
Write the first 7 members of an arithmetic sequence: a1=-3, d=6.
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) ?
- PIN - codes
How many five-digit PIN - code can we create using the even numbers?
- 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?
- Reference angle
Find the reference angle of each angle:
How many 4-tones chords (chord = at the same time sounding different tones) is possible to play within 7 tones?