The following Topics and Sub-Topics are covered in this chapter and are available on MSVgo:

You must have seen shapes all around you. The buildings, your food plates, clocks or even the displays inside a smartphone, all have a fixed shape that can be identified easily. All basic shapes are used to make complex figures that can be used in every-day life. Let us check the basic elementary shape builders that are elemental in constructing any shape.

We can check and compare two line segments by any of these three methods.

**Observation Comparison**: We can look at the given line segments with our naked eyes and use intuition to figure out these line segments’ lengths. This method is good if we need to pick the largest or smallest line segments, but fail short when required to know their exact lengths.**Tracing Method**: It is a simple method in which we take the first line segment and trace it on the other line segment by purring it over it. By this, we can find the largest as the bigger one would be extending over the smaller line segment.**Using a ruler and divider**: This method is used to measure the line segments using a ruler accurately. It is used in all geometrical constructions work.

Angles can be measured using a protractor or any square rulers.

**Right Angles**: These angles are 90 degrees apart from each other. Whenever two rays have a common endpoint and are 90 degrees apart, then that constitutes a right angle. You can construct**perpendicular lines**with this concept.**Straight Angle**: Straight angles are linear angles. It is possible when two rays with a common endpoint have the other end exactly opposite to each other linearly. This situation is also the largest possible distance between any two rays. The two rays make an angle of 180 degrees with each.**Angles Acute:**Acute angles are angles measuring less than 90 degrees. To measure such angles, use a protractor and measure the angle. You can also deduce it with observation.**Obtuse Angle**: Angles measuring greater than 90 degrees are called obtuse angles. You can use a protractor to measure such angles.

Angles are very popular and integral; a concept that is used in geometry. You can check the clocks that always depict some kind of angle during their movement in a real-life application.

The best and most accurate way to measure angles is to use a protractor and put it on the angle. But if you don’t have a protractor, you can make an observational guess or through the tracing method.

**Triangles**: Any closed polygon of three sides is termed as triangles. Triangle is the most basic form of polygon and a closed figure. There are also different types of triangles.

**Classification of Triangles:**

Triangles can be classified based on their sides and other properties. They are given below:

**Scalene triangle**: These triangles have three sides of unequal lengths. All of their sides are different.**Isosceles triangle**: These kinds of triangles have two equal sides, and the third side is different.**Equilateral Triangle**: When all the three sides of the triangle are the same, we have an equilateral triangle.

**Quadrilaterals**

Any closed figure with four sides is termed as quadrilaterals. To measure a triangle, you need to have a ruler and protractor. The internal sum property of any quadrilateral states that all the four internal angles sum to 360 degrees.

Let’s check on different kinds of quadrilaterals.

We have many different types of quadrilaterals, including squares, rectangles, rhombus, parallelogram and more.

**Polygons: **Any closed figure geometrical shape is called as polygons. Polygons are classified based on their number of sides and angles. We can have many examples of polygons such as triangles, quadrilaterals, hexagon, heptagon, octagon and decagons. The circle is also a polygon with infinite sides.

We can measure and understand polygons by checking their number of sides and angles using rulers and protractors.

Understanding elementary shapes is important. All the complex shapes and figures that we see around are composed of these basic shapes. Even basic shapes are composed of line segments, lines, rays, angles and other entities. We can see shapes all around us. While constructing any buildings or cars, the architects and designers use these simple geometrical shapes and figures to build a complex model that can show different properties upon interaction with nature. Shapes also provide us with the means to interact with nature. For example, roofs that are made slanting can help you wash off the rainwater from the roof. Aeroplanes and cars have streamlined shapes that can reduce the drag and air friction over the object’s body.

- What is the meaning of elementary shapes?

Elementary shapes are the basic geometrical shapes that can be made with freehand or using geometrical tools. These are the first shapes that we can make to build any complex shapes.

- What are the basic geometrical ideas?

Basic geometrical ideas are some simple shapes such as circles, squares, rectangle, triangle, angles, lines and more. These basic identities help us build complex geometrical figures.

- What is an RA tester in maths?

RS tester is a device that tests the nature of any surface in terms of texture and roughness. It is an instrument that can tell you about the surface.

- What are the 3 types of geometry?

The three types of geometry are Euclidean geometry, hyperbolic geometry and parabolic geometry.

- What are 10 geometric concepts?

The 10 geometric concepts are as follows: line segment, lines, angles, perpendicular, parallel lines, circles, rays, arcs, squares, rectangles, and more.

To explore more, visit MSVgo – a video-based learning app that provides a depth-video tutorial regarding the concept of Euclidean shapes and their properties.