Basic geometric shapes

Basic Concepts

The basic geometric figures on a plane are a point and a straight line.
And the simplest figures are a ray, a segment and a broken line. The minimum object in geometry is a point . Its peculiarity is that it has no dimensions: it has no height, length, radius. A point can only be determined by its location, which is usually denoted by one capital letter of the Latin alphabet.

A line can be made from many points, and geometric shapes can be made from several interconnected lines.

Taking courses in mathematics will help you quickly understand the types and properties of geometric shapes.

Each mathematical figure has its own value, which can be measured using formulas and attentiveness.

Area is one of the characteristics of a closed geometric figure, which gives us information about its size. S (square) - square sign.

The perimeter is usually called the sum of the lengths of all sides of a polygon. The perimeter is denoted by a capital Latin P.

If parameters are passed in different units of length, you need to convert all data to one unit of measurement.

Popular units for measuring area:

square millimeter (mm2);
square centimeter (cm2);
square decimeter (dm2);
square meter (m2);
square kilometer (km2);
hectare (ha).

Geometric bodies are a part of space that is limited by a closed surface of its outer boundary.

If all the points of a figure belong to the same plane, then it is flat .

A three-dimensional figure is a geometric figure in which all points are not on the same plane.

Examples of volumetric geometric shapes:

ball,
cone,
parallelepiped,
cylinder,
pyramid,
sphere.

Let's take a closer look at some figures, analyze their definitions and properties.

How to make Doman cards yourself:

Print the cards on thick paper or cardboard, 2, 4 or 6 pieces per sheet. To conduct classes using the Doman method, the cards are ready, you can show them to your child and say the name of the picture.

Good luck and new discoveries to your baby!

Educational video for children (toddlers and preschoolers) made according to the Doman method “Prodigy from the cradle” - educational cards, educational pictures on various topics from part 1, part 2 of the Doman method, which can be watched for free here or on our Channel Early Childhood Development on YouTube

Educational cards based on Glen Doman's method with pictures of flat geometric shapes for children

Educational cards geometric shapes according to Glen Doman's method with pictures of flat geometric shapes for children

Rectangle

A rectangle is a parallelogram in which all angles are right.

Rectangle properties:

The diagonals of a rectangle are equal and bisect at the point of intersection.
Around a rectangle, you can describe a circle with a center at the point of intersection of its diagonals and a radius that is equal to half the diagonal.

find out the area of a rectangle :

S = a × b, where a, b are the width and height of the rectangle.
S = a × √(d2 - a2), where a is the known side, d is the diagonal.
A diagonal is a line segment that connects opposite vertices of a figure. It is present in all figures whose number of vertices is more than three.
S = 0.5 × d2 ×