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Determine whether two triangles are similar

by Dr. Osama M. Khaled — published May 14, 2026 — last modified May 14, 2026 09:48 PM — 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

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

Use properties of rectangles to find unknown angle measures and side lengths

by Dr. Osama M. Khaled — published May 15, 2026 — last modified May 16, 2026 08:31 AM — filed under: Year 9

The rectangle is probably the most common and recognizable of all geometric figures

Located in Mathematics / Geometry / Quadrilaterals and Other Polygons

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

Use the formula for the sum of the angle measures of a polygon

by Dr. Osama M. Khaled — published May 16, 2026 — last modified May 16, 2026 08:28 AM — filed under: Year 9

The total sum of all the interior angles inside a polygon depends entirely on the number of sides it has

Located in Mathematics / Geometry / Quadrilaterals and Other Polygons

Area of complex shapes

by Dr. Osama M. Khaled — published Nov 05, 2020 — last modified May 25, 2026 10:01 AM — filed under: Year 9

These are more into practical questions in real life. We do not find shapes just in simple squares and circles. There are actually different types of shapes ...

Located in Mathematics / Geometry / Perimeters and Areas of Polygons

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 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 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

Definitions

by Dr. Osama M. Khaled — published Jun 30, 2022 — last modified Jul 13, 2024 10:28 PM — filed under: Year 9

Important definitions in data distributions in statistics

Located in Mathematics / Statistics / Data Distributions

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