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Riddle - Bottle, Cork and Coin

If you put a coin in a bottle and insert a cork in the neck, how can you remove the coin without removing the cork or breaking the bottle? Answer Simply push the cork into the bottle and then shake the bottle upside down until the coin comes out. <
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John Napier

John Napier was born in 1550, and died April 4, 1617. He was a Scottish mathematician. He was the inventor of the LOGARITHMS. He was educated at St. Andrew's University in Europe. In 1571 Napier returned to Scotland and devoted himself to his current estate and took part in the religious controversies of the time.
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Pyramid Area and Volume

AREA In a pyramid, we have the following areas: a) lateral area (A L): gathering the areas of the lateral faces. b) base area (A B): area of ​​the convex polygon (base of the pyramid). c) total area (A T): union of the lateral area with the base area. A T = A L + A B For a regular pyramid we have: where: Volume Cavalieri's principle ensures that an equivalent cone and pyramid have equal volumes: Next: Pyramid Trunk
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Challenge 158

A special symbol Difficulty level: The symbol represents a special operation with numbers. Here are some examples: 2 4 = 10 3 8 = 27 4 27 = 112 5 1 = 10 How much is 4 (8 7) worth? Challenge 157 Multiple of 9 Challenge Index Next >> Challenge 159 Little John Waiting for Bus
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How much is a cent worth?

The largest number accepted in the system of successive powers of ten is the million, first recorded in 1852. It represents the hundredth power of one million, or the number 1 followed by 600 zeros (although only used in Great Britain and Germany). ). Curiosity with Triangular Numbers Index Next >> Whole Number Squares
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Parable Equations

Let's consider the following cases: a) Parabola with vertex in origin, right concavity and axis of horizontal symmetry As the line d has equation and in the parable we have:; P (x, y); d PF = d Pd (definition); We then obtain the equation of the parable: y 2 = 2px b) Parabola with vertex at origin, concavity to the left and horizontal symmetry axis Under these conditions, the parable equation is: y 2 = -2px c) Parabola with vertex at origin, upward concavity and vertical symmetry axis x 2 = 2py d) vertex parabola in the origin, downward concavity and vertical symmetry axis x 2 = - 2py Next content: Analytical geometry - Straight
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