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  1. Determine whether two triangles are similar
    by Dr. Osama M. Khaled — published May 14, 2026 — last modified Aug 22, 2026 07:09 AM — filed under: Year 9
    Similar triangles have the same shape, but not necessarily the same size
    Located in Mathematics / Geometry / Congruent Triangles and Similar Triangles
  2. Diffusion through liquids and gases
    by Dr. Osama M. Khaled — published May 19, 2026 — last modified May 19, 2026 09:16 AM — filed under: Year 9
    Diffusion is the intermixing of molecules of substances due to random motion of the molecules
    Located in Physics / Liquids and Gases
  3. Directed Distance and the Distance Formula
    by Dr. Osama M. Khaled — published Aug 24, 2026 — last modified Aug 28, 2026 09:44 PM — filed under: Year10, Year 9
    Covers directed distance (signed length) between points on horizontal and vertical segments, and the distance formula derived from the Pythagorean theorem.
    Located in Mathematics / Calculus / From Geometry to Coordinate Geometry
  4. Dissociation, Ionic Equations, and Spectator Ions
    by Dr. Osama M. Khaled — published Nov 09, 2025 — last modified Nov 18, 2025 07:39 AM — filed under: Year 9
    One important aspect about ionic compounds that differs from molecular compounds has to do with dissolving in a liquid, such as water
    Located in Chemistry / Chemical Reactions and Equations
  5. Distributive Property
    by Dr. Osama M. Khaled — published May 28, 2023 — last modified Jul 12, 2024 10:06 PM — filed under: Year 8, Year 9
    Distributive property is often used to simplify algebraic expressions.
    Located in Mathematics / Algebra / Simplifying Algebraic Expressions
  6. Earth Satellites
    by Dr. Osama M. Khaled — published Mar 30, 2024 — last modified Jul 13, 2024 12:49 PM — filed under: Year 9
    Newton argued that if a cannon could be placed on a hill high enough to be outside the earth's atmosphere, and if the cannon could be made powerful enough, a ...
    Located in Physics / Gravity
  7. Elements and Compounds
    by Dr. Osama M. Khaled — published May 30, 2024 — last modified Aug 22, 2026 11:34 PM — filed under: Year 9
    All of the materials and substances that we experience are made up of elements
    Located in Physics / Atoms and Molecules
  8. Equations of a Line: Point-Slope, Slope-Intercept, Two-Point, and Intercept Forms
    by Dr. Osama M. Khaled — published Aug 24, 2026 — last modified Aug 28, 2026 09:44 PM — filed under: Year 10, Year 9
    Covers the equations of horizontal and vertical lines, and the point-slope, slope-intercept, two-point, and intercept forms of the equation of a nonvertical ...
    Located in Mathematics / Calculus / From Geometry to Coordinate Geometry
  9. Estimate Answers to percent problems involving 200%
    by Dr. Osama M. Khaled — published May 12, 2025 — last modified May 12, 2025 06:40 AM — filed under: Year 7, Year 8, Year 9
    Since 100% of a number is the number itself, it follows that 200% of a number would be twice the number.
    Located in Mathematics / … / Percent / Estimation with Percent
  10. Find powers of products
    by Dr. Osama M. Khaled — published Jan 18, 2024 — last modified Jul 12, 2024 10:20 PM — filed under: Year 9
    To raise a product to a power, raise each factor of the product to that power
    Located in Mathematics / Algebra / Multiplication Rules for Exponents
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