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āļ§ัāļ™āđ€āļŠāļēāļĢ์āļ—ี่ 7 āļุāļĄāļ āļēāļžัāļ™āļ˜์ āļž.āļĻ. 2569

📐 āŧ€āšĨāš‚āšēāš„āš°āš™ິāš”: āšŪູāššāšŪ່āšēāš‡, āšĄຸāšĄ, āŧāšĨāš° āŧ€āš™ື້āš­āš—ີ່

1. āš„āš§āšēāšĄāŧāšēāšāš‚āš­āš‡āŧ€āšĨāš‚āšēāš„āš°āš™ິāš”

āŧ€āšĨāš‚āšēāš„āš°āš™ິāš” (Geometry) āŧāšĄ່āš™āšŠāšēāš‚āšēāŧœຶ່āš‡āš‚āš­āš‡āš„āš°āš™ິāš”āšŠāšēāš” āš—ີ່āšŠຶāšāšŠāšēāš່āš―āš§āšັāššāšŪູāššāšŪ່āšēāš‡, āš‚āš°āŧœāšēāš”, āš•āšģāŧāŧœ່āš‡, āŧāšĨāš° āš„āš§āšēāšĄāšŠāšģāšžັāš™āš‚āš­āš‡āš§ັāš”āš–ຸāŧƒāš™āšžື້āš™āš—ີ່. āŧ€āšĨāš‚āšēāš„āš°āš™ິāš”āšĄີāššົāš”āššāšēāš”āšŠāšģāš„ັāš™āšĒ່āšēāš‡āšŦຼāšēāšāŧƒāš™āšŠີāš§ິāš”āš›āš°āšˆāšģāš§ັāš™ āŧ€āšŠັ່āš™ āšāšēāš™āš­āš­āšāŧāššāššāš­āšēāš„āšēāš™, āšāšēāš™āšໍ່āšŠ້āšēāš‡, āšŠິāšĨāš°āš›āš°, āš§ິāšŠāš°āš§āš°āšāšģ āŧāšĨāš° āš§ິāš—āš°āšāšēāšŠāšēāš”āš•່āšēāš‡āŧ†.

āŧ€āšĨāš‚āšēāš„āš°āš™ິāš”āŧ€āšີāš”āš‚ຶ້āš™āšĄāšēāš•ັ້āš‡āŧāš•່āšŠāš°āŧ„āŧāŧ‚āššāšŪāšēāš™ āŧ€āšŠັ່āš™ āš­āšēāš™āšēāšˆັāšāš­ີāšĒິāšš āŧāšĨāš° āšāšĢີāš āŧ€āšžື່āš­āš™āšģāŧƒāšŠ້āŧƒāš™āšāšēāš™āš§ັāš”āŧāš—āšāš—ີ່āš”ິāš™ āŧāšĨāš° āšāšēāš™āšໍ່āšŠ້āšēāš‡. āš•ໍ່āšĄāšēāŧ„āš”້āšŪັāššāšāšēāš™āšžັāš”āš—āš°āš™āšēāšĒ່āšēāš‡āŧ€āš›ັāš™āšĨāš°āššົāšš āŧ‚āš”āšāš™ັāšāš„āš°āš™ິāš”āšŠāšēāš”āšŠື່āš”ັāš‡āŧ€āšŠັ່āš™ Euclid.

2. āšŪູāššāšŪ່āšēāš‡āš—āšēāš‡āŧ€āšĨāš‚āšēāš„āš°āš™ິāš”

āšŪູāššāšŪ່āšēāš‡ (Shapes) āŧāšĄ່āš™āšžື້āš™āš–āšēāš™āš—ີ່āšŠāšģāš„ັāš™āš‚āš­āš‡āŧ€āšĨāš‚āšēāš„āš°āš™ິāš” āŧ‚āš”āšāŧāšš່āš‡āš­āš­āšāŧ€āš›ັāš™ 2 āš›āš°āŧ€āšžāš”āŧƒāšŦāš່:

2.1 āšŪູāššāšŪ່āšēāš‡āšŠāš­āš‡āšĄິāš•ິ (2D Shapes)

āŧ€āš›ັāš™āšŪູāššāšŪ່āšēāš‡āš—ີ່āšĄີāš„āš§āšēāšĄāšāšēāš§ āŧāšĨāš° āš„āš§āšēāšĄāšāš§້āšēāš‡ āŧāš•່āššໍ່āšĄີāš„āš§āšēāšĄāŧœāšē āŧ€āšŠັ່āš™:

āšˆຸāš” (Point)

āŧ€āšŠັ້āš™ (Line)

āšŠāšēāšĄāšŦຼ່āš―āšĄ (Triangle)

āšŠີ່āšŦຼ່āš―āšĄ (Rectangle, Square)

āš§ົāš‡āšĄົāš™ (Circle)

āšŪູāššāšŪ່āšēāš‡ 2D āš–ືāšāš™āšģāŧƒāšŠ້āŧƒāš™āšāšēāš™āš§āšēāš”āŧāšœāš™āš—ີ່, āšāšēāš™āš­āš­āšāŧāššāššāšĨāšēāšāšĨāš°āš­āš―āš”, āŧāšĨāš° āšāšēāš™āš„āšģāš™āš§āš™āŧ€āš™ື້āš­āš—ີ່.

2.2 āšŪູāššāšŪ່āšēāš‡āšŠāšēāšĄāšĄິāš•ິ (3D Shapes)

āŧ€āš›ັāš™āšŪູāššāšŪ່āšēāš‡āš—ີ່āšĄີāš„āš§āšēāšĄāšāšēāš§, āš„āš§āšēāšĄāšāš§້āšēāš‡ āŧāšĨāš° āš„āš§āšēāšĄāšŠູāš‡ āŧ€āšŠັ່āš™:

āšĨູāšāššāšēāš” (Cube)

āšŠີ່āšŦຼ່āš―āšĄāšĄຸāšĄāšŠāšēāš (Rectangular Prism)

āš—ົ່āš‡āšົāšĄ (Sphere)

āšŪູāššāšāš­āš™ (Cone)

āšŪູāššāš—ໍ່ (Cylinder)

3. āšĄຸāšĄ (Angles)

āšĄຸāšĄāŧāšĄ່āš™āšāšēāš™āšໍ່āš•ົāš§āš‚āš­āš‡āŧ€āšŠັ້āš™āšŠāš­āš‡āŧ€āšŠັ້āš™āš—ີ່āšĄāšēāšžົāššāšັāš™āšĒູ່āšˆຸāš”āš”āš―āš§. āšĄຸāšĄāšĄີāš„āš§āšēāšĄāšŠāšģāš„ັāš™āŧƒāš™āšāšēāš™āš­āš­āšāŧāššāšš āŧāšĨāš° āšāšēāš™āšໍ່āšŠ້āšēāš‡.

āš›āš°āŧ€āšžāš”āš‚āš­āš‡āšĄຸāšĄ:

āšĄຸāšĄāŧāšŦຼāšĄ (Acute Angle)

āšĄຸāšĄāšŠāšēāš (Right Angle)

āšĄຸāšĄāš›້āšēāš™ (Obtuse Angle)

āšĄຸāšĄāš•ົāš‡ (Straight Angle)

āšĄຸāšĄāšŪāš­āššāš§ົāš‡ (Full Angle)

4. āŧ€āš™ື້āš­āš—ີ່ (Area)

āŧ€āš™ື້āš­āš—ີ່āŧāšĄ່āš™āš‚āš°āŧœāšēāš”āš‚āš­āš‡āšžື້āš™āš—ີ່āš—ີ່āšŪູāššāšŪ່āšēāš‡āŧƒāš”āŧœຶ່āš‡āš„āš­āššāš„āš­āš‡. āšāšēāš™āš„āšģāš™āš§āš™āŧ€āš™ື້āš­āš—ີ່āŧ€āš›ັāš™āšŠິ່āš‡āšˆāšģāŧ€āš›ັāš™āŧƒāš™āšāšēāš™āšໍ່āšŠ້āšēāš‡, āšāš°āšŠິāšāšģ āŧāšĨāš° āšŠີāš§ິāš”āš›āš°āšˆāšģāš§ັāš™.

āš•ົāš§āšĒ່āšēāš‡:

āšŠີ່āšŦຼ່āš―āšĄ: āŧ€āš™ື້āš­āš—ີ່ = āšāš§້āšēāš‡ × āšāšēāš§

āšŠāšēāšĄāšŦຼ່āš―āšĄ: ½ × āš–āšēāš™ × āšŠູāš‡

āš§ົāš‡āšĄົāš™: π × r²

📐 Geometry: Shapes, Angles, and Area (English)

1. Definition of Geometry

Geometry is a branch of mathematics that studies shapes, sizes, positions, and relationships of objects in space. It plays a crucial role in everyday life, including architecture, engineering, art, science, and technology. Geometry helps humans understand space, distance, and form.

Historically, geometry originated in ancient civilizations such as Egypt and Greece. The Greek mathematician Euclid systematized geometry into logical rules and principles that are still taught today.

2. Geometric Shapes

Shapes are fundamental elements of geometry and can be classified into two main categories:

2.1 Two-Dimensional Shapes (2D)

These shapes have length and width but no thickness. Examples include:

Point

Line

Triangle

Square and Rectangle

Circle

2D shapes are widely used in drawings, maps, and surface design.

2.2 Three-Dimensional Shapes (3D)

These shapes have length, width, and height, giving them volume. Examples include:

Cube

Rectangular Prism

Sphere

Cone

Cylinder

3D shapes are important in construction, manufacturing, and physical modeling.

3. Angles

An angle is formed when two lines meet at a common point called a vertex. Angles are measured in degrees and are essential in design, engineering, and mathematics.

Types of angles include:

Acute Angle

Right Angle

Obtuse Angle

Straight Angle

Full Angle

4. Area

Area is the amount of surface covered by a shape. Calculating area is essential in real-life applications such as land measurement, construction, and design.

Examples:

Rectangle: Area = length × width

Triangle: Area = ½ × base × height

Circle: Area = π × radius²

✨ āšŠāš°āšŦຼຸāšš / Conclusion

āŧ€āšĨāš‚āšēāš„āš°āš™ິāš”āŧ€āš›ັāš™āšžື້āš™āš–āšēāš™āš—ີ່āšŠāšģāš„ັāš™āš‚āš­āš‡āš„āš§āšēāšĄāšŪູ້āš—āšēāš‡āš„āš°āš™ິāš”āšŠāšēāš” āŧāšĨāš° āšĄີāššົāš”āššāšēāš”āšĒ່āšēāš‡āšŦຼāšēāšāŧƒāš™āŧ‚āšĨāšāšŠāš°āŧ„āŧāŧƒāŧ່. Geometry provides a foundation for understanding the physical world and solving practical problems.


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