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  1. Use the Pythagorean theorem to find the exact length of a side of a right triangle
    by Dr. Osama M. Khaled — published Oct 20, 2025 — last modified Oct 27, 2025 08:37 AM — filed under: Year 8
    If we know the lengths of any two sides of a right triangle, we can find the length of the third side using the Pythagorean theorem.
    Located in Mathematics / Geometry / The Pythagorean Theorem
  2. Specific Gravity
    by Dr. Osama M. Khaled — published Aug 14, 2024 — last modified Aug 17, 2024 04:20 AM — filed under: Year 8, Year 9, Year 10
    The specific gravity of a substance is often listed in tables instead of either mass density or weight density
    Located in Physics / Solids
  3. Atoms in a solid
    by Dr. Osama M. Khaled — published Jul 24, 2024 — last modified Jul 25, 2024 11:08 AM — filed under: Year 8
    When matters is in a solid state, its atoms or molecules are arranged in definite, fixed patterns
    Located in Physics / Solids
  4. Evaluate expressions containing absolute values
    by Dr. Osama M. Khaled — published May 08, 2026 — last modified May 09, 2026 04:26 AM — filed under: Year 8
    We use the order of operations rule to evaluate more complicated expressions that contain absolute values.
    Located in Mathematics / … / Integers / Order of Operations and Estimation
  5. Find the volume of rectangular solids, prisms, and pyramids
    by Dr. Osama M. Khaled — published May 18, 2026 — last modified May 18, 2026 08:57 PM — filed under: Year 8, Year 9
    The volume of a three-dimensional figure is a measure of its capacity
    Located in Mathematics / Geometry / Volume
  6. Cell membrane
    by Dr. Osama M. Khaled — published Jul 17, 2022 — last modified Jul 13, 2024 10:18 PM — filed under: Year 8
    Cell Membrane provides cell protection
    Located in Biology / Cell Structure
  7. Inside Plasma Membrane
    by Dr. Osama M. Khaled — published Jul 17, 2022 — last modified Jul 13, 2024 10:18 PM — filed under: Year 8
    Cytoplasm and Nucleoplasm
    Located in Biology / Cell Structure
  8. Movement through the Cell Membrane
    by Dr. Osama M. Khaled — published Nov 07, 2022 — last modified Aug 02, 2024 10:59 PM — filed under: Year 8
    In addition to providing protection, shape, and strength to the cell, the membrane helps regulate the flow of materials in and out of the cell
    Located in Biology / Cell Structure
  9. Chemistry as a Science
    by Dr. Osama M. Khaled — published Jul 28, 2022 — last modified Jul 13, 2024 10:16 PM — filed under: Year 8
    Chemistry is just another branch of science
    Located in Chemistry / Introduction
  10. Use more than one property of equality to solve equations
    by Dr. Osama M. Khaled — published Nov 07, 2023 — last modified Jul 12, 2024 10:16 PM — filed under: Year 8
    More complicated equations may require using more than one property to solve it.
    Located in Mathematics / Algebra / Solving Equations with Equality
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