Cave

Caves are underground hollows, formed by natural processes, with a depth of at least 2m. Prehistoric humans often used them as shelters.

The rock cycle

Due to the effect of both exogenic and endogenic forces, rocks constantly change. This is called the rock cycle.

Igneous rocks

Igneous rocks, like andesite and basalt, are formed when erupting lava solidifies on the surface. Due to erosion over millions of years signs of past...

Plotting parallel lines – Solution II

Let’s construct a rhombus such that one of its sides lies on line e and point P is one of the vertices on the opposite side.

Dog tricks

Man's most loyal friend is the dog. They are excellent at guarding houses and can also be taught to perform minor tricks for us, too.

Sarcophagus

The recording shows a more than 2000-year-old gilded sarcophagus. You can see the names of the deceased and his protecting gods on the coffin.

35mm cinema projector

Watch this video to learn how a cinema projector works and how a film appears on the screen.

Reflecting a circle across an axis

Axis t and a circle with centre O and radius r are given on a particular plane. Let’s plot the mirror image of the circle.

How airbags work

A compound called sodium azide is responsible for the operation of airbags.

The hot ice experiment

The words hot and ice together? There must be a trick somewhere. Let’s have a look.

Plotting a perpendicular to a line at a given point P on the line

Both line e and point P, which is situated on it, are given. Let’s plot line g to include point P on line e so that it is perpendicular to line e.

Plotting a perpendicular on a line from a point P that is not on the line

Both line e and point P, which is not situated on line e, are given. Let’s plot line g such that it passes through point P and is perpendicular to line e.

Archimedes' seesaw

In this experiment, we use buoyancy to study the balance of two glasses of water.

Plotting parallel lines – Solution I

Let’s plot line g such that it is parallel to line e and passes through point P.

Reflecting a line segment across an axis

Axis t and line segment AB are given on a plane. Let’s plot the mirror image of line segment AB across t.

Hydrogen balloon explosion

In this experiment, we study the properties of hydrogen gas.

Archimedes’ principle with gases

Is there a difference between the weight of a plastic bottle filled with air and the weight of a crushed one?

Constructing the perpendicular bisector of a line segment

Let’s construct the perpendicular bisector of a 6-cm-long line segment.

Plotting an angle bisector

In this video, we plot the angle bisector of a given alpha angle.

The focus of a jar

Studying the focal point of a jar filled with water.

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