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Find the area of figures that are combinations of polygons

by Dr. Osama M. Khaled — published May 16, 2026 — last modified May 16, 2026 11:50 PM — filed under: Year 9

To find the area of an irregular shape, break up the shape into familiar polygons. Find the area of each polygon and then add the results

Located in Mathematics / Geometry / Perimeters and Areas of Polygons

Find the percent of increase or decrease

by Dr. Osama M. Khaled — published Dec 24, 2024 — last modified May 12, 2025 06:16 AM — filed under: Year 7, Year 8, Year 9

Percents can be used to describe how a quantity has changed

Located in Mathematics / … / Percent / Applications of Percent

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

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

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

Foundations of Function Notation and Representation

by Dr. Osama M. Khaled — published May 23, 2026 — last modified May 23, 2026 08:58 PM — filed under: Year 9, Year 10

This quiz tests your understanding of function notation, the distinction between f and f(x), independent vs. dependent variables, and the four modes of ...

Located in Mathematics / Calculus / The Concept of a Function

Gases in Motion: Kinetic Theory

by Dr. Osama M. Khaled — published Jul 08, 2026 — last modified Jul 14, 2026 08:00 AM — filed under: Year 9, Year 11, Year 12

Explore the postulates of the kinetic theory of gases and what it means for a gas to be ideal versus real

Located in Chemistry / Gases

Geometry Basics

by Dr. Osama M. Khaled — published Oct 18, 2020 — last modified Jul 13, 2024 10:52 PM — filed under: Year 9

Test your basic knowledge about geometry. We all need some refreshment every now and then. You think you remember everything about geometry. You may be ...

Located in Mathematics / Geometry / Fundamentals

Geometry Definitions

by Dr. Osama M. Khaled — published May 22, 2022 — last modified Jul 13, 2024 10:46 PM — filed under: Year 9

Some essential definitions in geometry

Located in Mathematics / Geometry / Fundamentals

Graphs for categorical variables

by Dr. Osama M. Khaled — published Aug 11, 2022 — last modified Jul 13, 2024 10:12 PM — filed under: Year 9

The values of a categorical variable are labels for the categories, such as “female” and “male"

Located in Mathematics / Statistics / Data Distributions

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