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  1. Shadow Problem – Tree Height
    by Dr. Osama M. Khaled — published May 14, 2026 — last modified May 15, 2026 10:17 AM Located in Mathematics / … / Congruent Triangles and Similar Triangles / Use similar triangles to find unknown lengths in application problems
  2. Building Height from a Stake's Shadow
    by Dr. Osama M. Khaled — published May 14, 2026 — last modified May 15, 2026 10:28 AM Located in Mathematics / … / Congruent Triangles and Similar Triangles / Use similar triangles to find unknown lengths in application problems
  3. Indirect Measurement – Width of a River
    by Dr. Osama M. Khaled — published May 14, 2026 — last modified May 15, 2026 10:17 AM Located in Mathematics / … / Congruent Triangles and Similar Triangles / Use similar triangles to find unknown lengths in application problems
  4. Quadrilaterals and Other Polygons
    by Dr. Osama M. Khaled — published May 15, 2026 — last modified May 16, 2026 08:10 AM
    Quadrilaterals and Other Polygons is a branch of geometry focused on the properties, classification, and area calculations of closed two-dimensional shapes ...
    Located in Mathematics / Geometry
  5. Classify quadrilaterals
    by Dr. Osama M. Khaled — published May 15, 2026 — last modified May 16, 2026 08:32 AM — filed under: Year 9
    A quadrilateral is a polygon with four sides
    Located in Mathematics / Geometry / Quadrilaterals and Other Polygons
  6. What Is a Quadrilateral?
    by Dr. Osama M. Khaled — published May 15, 2026 — last modified May 15, 2026 07:57 PM Located in Mathematics / … / Quadrilaterals and Other Polygons / Classify quadrilaterals
  7. Match Each Quadrilateral to Its Definition
    by Dr. Osama M. Khaled — published May 15, 2026 Located in Mathematics / … / Quadrilaterals and Other Polygons / Classify quadrilaterals
  8. Identify the Rhombus
    by Dr. Osama M. Khaled — published May 15, 2026 — last modified May 15, 2026 07:57 PM Located in Mathematics / … / Quadrilaterals and Other Polygons / Classify quadrilaterals
  9. Classify: Which Shapes Are Parallelograms?
    by Dr. Osama M. Khaled — published May 15, 2026 — last modified May 15, 2026 07:57 PM Located in Mathematics / … / Quadrilaterals and Other Polygons / Classify quadrilaterals
  10. Properties of a Rectangle
    by Dr. Osama M. Khaled — published May 15, 2026 — last modified May 15, 2026 07:57 PM Located in Mathematics / … / Quadrilaterals and Other Polygons / Classify quadrilaterals
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