Khối tròn xoay (bài tập)

Bài tập về sự hình thành các khối tròn xoay.

Conic solids

This animation demonstrates various types of cones and pyramids.

Sputnik 1 (1957)

The Soviet-made satellite was the first spacecraft to be launched into outer space (in October 1957).

Tall buildings

Tall buildings are mementoes of human history and technological development.

Euler's polyhedron formula

The theorem formulated by Leonhard Euler describes one of the basic properties of convex polyhedra.

The Hungarian Crown Jewels

The best-known piece of the Hungarian Crown Jewels is the Holy Crown.

Oxygen (O₂) (intermediate)

A colourless, odourless gas, an important component of the atmosphere, indispensable to sustain terrestrial life.

Coenzyme A

An acyl-carrier coenzyme taking part in both anabolic and catabolic processes.

Surface area of spheres (demonstration)

The surface of a sphere consists of the set of points which are all at the same distance from a given point in space.

Flood defence system

The protective embankment, or, in case of minor floods, the summer dyke ensures the protection against flood damage.

British soldier (World War I)

During World War I, Britain was part of the military alliance called the ´Triple Entente´.

Volume of spheres (Cavalieri´s principle)

Calculating the volume of a sphere is possible using an appropriate cylinder and cone.

Nitrogen (N₂) (intermediate)

A colourless, odourless, non-reactive gas, it constitutes 78.1% of Earth´s atmosphere.

Tiktaalik

A transitional form between fish and tetrapods, or four-limbed vertebrates.

European ground squirrel

Subterranean rodents widespread in Central- and Eastern Europe.

Carbonate ion (CO₃²⁻)

A compound ion produced from carbonic acid by releasing protons.

German soldier (World War I)

German sordiers in the First World War were well trained and used modern weapons.

Carbon dioxide (CO₂) (trung cấp)

Chất khí không màu, không mùi, nặng hơn không khí. Cần thiết cho quá trình quang hợp của thực vật.

The Hungarian army in the 15th century (cavalry)

One of the main units of Matthias Corvinus´ Black Army was the cavalry.

Medieval knight

Medieval knights were vassals of feudal lords and fought on horseback in battles.

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