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  1. Find the Sum for a 7-Sided Polygon
    by Dr. Osama M. Khaled — published May 16, 2026 Located in Mathematics / … / Quadrilaterals and Other Polygons / Use the formula for the sum of the angle measures of a polygon
  2. Find the Sum for a 13-Sided Polygon
    by Dr. Osama M. Khaled — published May 16, 2026 Located in Mathematics / … / Quadrilaterals and Other Polygons / Use the formula for the sum of the angle measures of a polygon
  3. Find the total cost of the child's car seat if its sale price is $249.50 and its sales tax rate is 7.2%
    by Dr. Osama M. Khaled — published Aug 23, 2024 Located in Mathematics / … / Applications of Percent / Calculate sales taxes, total cost, and tax rates
  4. Find the Unknown Angle in a Rectangle
    by Dr. Osama M. Khaled — published May 15, 2026 — last modified May 15, 2026 08:50 PM Located in Mathematics / … / Quadrilaterals and Other Polygons / Use properties of rectangles to find unknown angle measures and side lengths
  5. Find the Unknown Angle in Rectangle RSTU
    by Dr. Osama M. Khaled — published May 15, 2026 — last modified May 15, 2026 08:50 PM Located in Mathematics / … / Quadrilaterals and Other Polygons / Use properties of rectangles to find unknown angle measures and side lengths
  6. Find the Unknown in △DEF ∼ △GHI
    by Dr. Osama M. Khaled — published May 14, 2026 Located in Mathematics / … / Congruent Triangles and Similar Triangles / Determine whether two triangles are similar
  7. Find the Unknown Side – Similar Triangles
    by Dr. Osama M. Khaled — published May 14, 2026 Located in Mathematics / … / Congruent Triangles and Similar Triangles / Determine whether two triangles are similar
  8. Find the volume of cylinders, cones, and spheres
    by Dr. Osama M. Khaled — published May 18, 2026 — last modified May 18, 2026 09:00 PM — filed under: Year 9
    The volume of a three-dimensional figure is a measure of its capacity. Cylinders, cones, and spheres are no difference from this rule.
    Located in Mathematics / Geometry / Volume
  9. 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
  10. Find unknown angle measures of trapezoids
    by Dr. Osama M. Khaled — published May 16, 2026 — last modified May 16, 2026 08:30 AM — filed under: Year 9
    A trapezoid is a quadrilateral with exactly two sides parallel
    Located in Mathematics / Geometry / Quadrilaterals and Other Polygons
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