Math Open Reference: Area of a Rhombus

The measurements are all in the can. The review for the math portion of the General Certificate of Secondary Education assessments provides scholars the opportunity to review finding volume and surface area of a cylinder. Pupils work on...

This production, the second installment in a series of circles, demonstrates the process of finding the area of a circle. It is effective as an introductory tool. However, it needs to explain the reasoning behind the formula because that...

Sliding over a corner makes a rectangle. The resource demonstrates why the formula of the area of a parallelogram works. As part of a larger playlist on basic geometry, the video works examples dealing with parallelogram areas.

Rectangles, parallelograms, and now trapezoids — so many quadrilaterals! Building on the previous lessons in the series, the video introduces the formula for the area of a trapezoid. The instructor shows images of trapezoids and...

Short, but to the point, an informative resource does the job! A quick video lesson describes how to calculate the area of a semi-circle. Learners watch the video tutorial and then practice with the included practice problems.

Don't avoid the cuboid. A short video describes how to find the surface area of a rectangular prism by adding the areas of all its sides. The narrator of the video works through two examples using the process to ensure understanding.

The lateral surface area of a cone. Hmmm, what does that mean? Oh, it means the part you see if the cone was sitting on a flat surface, so it does not include the base. But if you want to include the base then it would be finding the...

A regular hexagon is made of six congruent triangles. A video lesson shows learners how to use this information to find the area of a hexagon given the side length. Because the triangles are equilateral, they use the Pythagorean Theorem...

Roll a video into your lesson plans. Using a toilet paper roll, the narrator of the video describes how the lateral area of a cylinder is in the shape of a rectangle. Finding the lateral area and the area of the base circles gives the...

Trapezium or trapezoid is a matter location! A British narrator explains the process of finding the area of a trapezium, otherwise known as a trapezoid. After watching several examples, learners practice the skill with the included...