Course

Geometry

Khan Academy

This Geometry course is designed to provide a comprehensive understanding of various geometric concepts. A basic knowledge of Algebra I is necessary to thrive in this course. The course will cover:

  • Introduction to angles, including complementary and supplementary angles.
  • Understanding similar triangles and their properties.
  • Calculating area and perimeter for various shapes.
  • Exploring circles, Pythagorean theorem, and special triangles (45-45-90 and 30-60-90).
  • Utilizing Heron's Formula for area calculations.
  • Proving important geometric relationships, such as inscribed angles.

By the end of the course, students will have a solid foundation in geometry, enabling them to progress to Trigonometry with confidence.

Course Lectures
  • The introduction to angles covers the basic definition and significance of angles in geometry. Students will learn about:

    • Different types of angles and their properties.
    • Angles formed in a circle.
    • Complementary and supplementary angles and their applications.

    This module lays the groundwork for understanding more complex angle relationships in later modules.

  • Angles Part 2
    Salman Khan

    This module continues the exploration of angles, focusing on complementary and supplementary angles. It also introduces:

    • Definitions and examples of opposite angles.
    • Real-world applications of angle relationships.

    Students will engage in exercises to reinforce their understanding of these concepts.

  • Angles Part 3
    Salman Khan

    This module dives into the angles formed when a transversal intersects parallel lines. Key topics include:

    • Understanding corresponding angles.
    • Identifying alternate interior and exterior angles.
    • Using angle relationships to solve problems.

    Students will practice identifying and calculating these angles through interactive exercises.

  • In this module, students will deepen their understanding of angles associated with parallel lines. They will learn:

    • How to calculate various angles formed by parallel lines and a transversal.
    • The significance of these angles in geometric proofs and calculations.

    Hands-on exercises will solidify the concepts learned in this module.

  • This module provides practical examples of angles formed by parallel lines in various contexts. Students will:

    • Work through real-life problems involving parallel lines and angles.
    • Explore different scenarios to apply their knowledge of angle relationships.

    By the end of this module, students should feel confident in identifying and solving angle problems.

  • The Angle Game
    Salman Khan

    The Angle Game module offers an interactive approach to applying angle knowledge. Students will:

    • Engage in a game format to solve for unknown angles.
    • Reinforce their understanding through fun challenges.

    This hands-on experience helps solidify concepts learned in previous modules.

  • Similar Triangles
    Salman Khan

    This module introduces similar triangles, focusing on the concept that triangles can be similar through:

    • Proportional sides and corresponding angles.
    • Applications of similar triangles in real-world contexts.

    Students will explore various examples to understand the significance of similarity in geometry.

  • Similar Triangles 2
    Salman Khan

    In this module, students will delve further into similar triangles, exploring:

    • More complex examples of triangle similarity.
    • Applications in geometry and other fields.

    This module reinforces previous concepts while challenging students to apply their knowledge in new contexts.

  • Area and Perimeter
    Salman Khan

    This module covers area and perimeter calculations for basic geometric shapes, including:

    • Rectangles and their properties.
    • Triangles and methods for calculating area.

    Students will practice calculations and apply these concepts in problem-solving scenarios.

  • This module focuses on circles, specifically the relationship between radius, diameter, and circumference. Key topics include:

    • Definitions of radius, diameter, and circumference.
    • Formulas for calculating circumference and area of circles.

    Students will engage in exercises to apply these concepts to real-world situations involving circles.

  • This introduction to the Pythagorean Theorem covers the fundamental concept that relates the sides of a right triangle. Key points include:

    • Understanding the theorem’s formula and its applications.
    • Identifying right triangles in geometric figures.

    Students will practice using the theorem to solve problems involving right triangles.

  • This module provides more examples of the Pythagorean Theorem, focusing on:

    • Solving various problems using the theorem.
    • An introduction to 45-45-90 triangles and their properties.

    Students will gain a deeper understanding of how the theorem applies to these specific types of triangles.

  • 45-45-90 Triangles
    Salman Khan

    This module introduces students to the properties of 45-45-90 triangles. Topics covered include:

    • The relationship between the legs and hypotenuse.
    • Applications in problem-solving scenarios.

    Students will practice recognizing and working with these triangles to enhance their understanding of triangle properties.

  • This module provides an introduction to 30-60-90 triangles, emphasizing:

    • The unique properties and relationships of these triangles.
    • Practical examples and applications in geometry.

    Students will build on their knowledge of special triangles to solve complex problems.

  • 30-60-90 Triangles II
    Salman Khan

    This module continues the exploration of 30-60-90 triangles, focusing on:

    • More examples to solidify understanding.
    • Applications of these triangles in various geometric problems.

    Students will engage in exercises to deepen their comprehension of triangle properties.

  • Heron's Formula
    Salman Khan

    This module introduces Heron's Formula, which allows for the calculation of the area of a triangle when only the lengths of its sides are known. Key topics include:

    • Understanding the formula and how to apply it.
    • Real-world applications of Heron's Formula.

    Students will practice using the formula in various scenarios to enhance their problem-solving skills.

  • This module presents the first part of the proof of Heron's Formula, focusing on:

    • The derivation of the formula and its significance.
    • Steps involved in the proof process.

    Students will develop a deeper understanding of the mathematical foundations of geometric area calculations.

  • This module completes the proof of Heron's Formula, demonstrating that the expression derived in the previous module is indeed Heron's Formula. Key points include:

    • Finalizing the proof with clear explanations.
    • Understanding the implications of the proof in geometry.

    Students will appreciate the rigor and significance of geometric proofs in mathematical theory.

  • This module illustrates an important geometric property: an inscribed angle is half of a central angle that subtends the same arc. Key aspects include:

    • Understanding the definitions of inscribed and central angles.
    • Proofs demonstrating the relationship between these angles.

    Students will engage in exercises to apply this knowledge in various geometric problems.

  • This module focuses on calculating the area of an equilateral triangle inscribed in a circle, utilizing basic trigonometric concepts. Students will:

    • Learn the relationship between the circle and the triangle.
    • Apply trigonometry to solve for the area effectively.

    This module encourages the application of geometric and trigonometric principles in problem-solving.

  • This module presents a proof showing that a triangle inscribed in a circle with a diameter as one side is a right triangle. Key points include:

    • Understanding the significance of this property in geometry.
    • Engaging with proofs and real-world applications.

    Students will appreciate the elegance of geometric proofs and their relevance to triangle properties.

  • This module examines the area of diagonal-generated triangles within rectangles, emphasizing their equality. Students will learn:

    • The significance of diagonal properties in geometry.
    • Applications of these properties in area calculations.

    Through engaging exercises, students will enhance their understanding of geometric relationships.