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    Mathematics 101

    Receive aemail containing the next unit.
    • Reminder of Fundamentals
      • 1.1Basic Arithmetics
      • 1.2Introduction to Numbers
      • 1.3Simple Equations
    • Advanced Arithmetics
      • 2.1Multiplication and Division
      • 2.2Fractions and Decimals
      • 2.3Basic Algebra
    • Introduction to Geometry
      • 3.1Shapes and Patterns
      • 3.2Introduction to Solid Geometry
      • 3.3Concept of Angles
    • In-depth Geometry
      • 4.1Polygon and Circles
      • 4.2Measurements - Area and Volume
      • 4.3Geometry in the Everyday world
    • Deeper into Numbers
      • 5.1Integers
      • 5.2Ratio and Proportion
      • 5.3Percentages
    • Further into Algebra
      • 6.1Linear Equations
      • 6.2Quadratic Equations
      • 6.3Algebraic Expressions and Applications
    • Elementary Statistics & Probability
      • 7.1Data representation
      • 7.2Simple Probability
      • 7.3Understanding Mean, Median and Mode
    • Advanced Statistics, Probability
      • 8.1Advanced Probability Concepts
      • 8.2Probability Distributions
      • 8.3Advanced Data Analysis
    • Mathematical Logic
      • 9.1Introduction to Mathematical Logic
      • 9.2Sets and Relations
      • 9.3Basic Proofs and Sequences
    • Calculus
      • 10.1Introduction to Limits and Differentiation
      • 10.2Introduction to Integration
      • 10.3Applications of Calculus
    • Calculus
      • 11.1Introduction to Limits and Differentiation
      • 11.2Introduction to Integration
      • 11.3Applications of Calculus
    • Trigonometry I
      • 12.1Basic Trigonometry
      • 12.2Trigonometric Ratios and Transformations
      • 12.3Applications of Trigonometry
    • Trigonometry II & Conclusion
      • 13.1Advanced Trigonometry
      • 13.2Trigonometric Equations
      • 13.3Course conclusion and wrap-up

    Introduction to Geometry

    Understanding the Concept of Angles

    something that is formed when two rays meet at a single or same point

    Something that is formed when two rays meet at a single or same point.

    Angles are a fundamental concept in geometry, playing a crucial role in defining and understanding shapes and patterns. This unit will provide a comprehensive understanding of what angles are, how they are measured, and the different types of angles we encounter in geometry.

    What is an Angle?

    An angle is formed when two lines meet at a common point. This point is known as the vertex of the angle, and the two lines are the arms or sides of the angle. The amount of turn between these two lines is what we refer to as the 'size' of the angle.

    Measuring Angles

    Angles are measured in degrees (°). A full turn, or a circle, is 360°. The degree measure of an angle tells us how much one of the arms needs to be rotated around the vertex to coincide with the other arm.

    Types of Angles

    There are several types of angles based on their degree measurements:

    1. Acute Angle: An angle that measures less than 90°.
    2. Right Angle: An angle that measures exactly 90°. It forms a perfect L shape.
    3. Obtuse Angle: An angle that measures more than 90° but less than 180°.
    4. Straight Angle: An angle that measures exactly 180°. It forms a straight line.
    5. Reflex Angle: An angle that measures more than 180° but less than 360°.
    6. Complete Angle: An angle that measures exactly 360°. It forms a complete circle.

    Angle Properties of Geometric Shapes

    Different geometric shapes have different angle properties. For example, all angles in a square are right angles, while a triangle has angles that add up to 180°.

    Complementary and Supplementary Angles

    Two angles are said to be complementary if their measures add up to 90°. Similarly, two angles are supplementary if their measures add up to 180°. These concepts are often used in solving geometric problems.

    By understanding the concept of angles, you will be able to identify and classify different types of angles, understand their properties, and apply this knowledge to solve problems in geometry. This foundational knowledge will be built upon in the subsequent units and modules.

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    Next up: Polygon and Circles