The geometry tutorial investigates rectangles. Topics included are diagonals, area, and perimeter. The activity has several examples with detailed solutions.

Explore this course on infinity the including topics of the continuum hypothesis, Cantor's diagonal, and countability.

Electron orbitals. Diagonal rule. Dot diagrams. The periodic table. There's so much to know about the tiniest building blocks of life- atoms. [4:41]

This inquiry lesson explores the definitions of quadrilaterals and the properties of the diagonals of quadrilaterals to classify quadrilaterals. Students will work cooperatively to justify conclusions. This lesson plan was created by...

Develop problem solving skills working with pentagons and then check your results.

Use this calculator to calculate unknown variables for a cube such as a side length, face diagonal, solid diagonal, surface area, and volume.

WebMath will calculate the side length, diagonal length, perimeter, area, or volume, given the side, perimeter, diagonal, or area. This site also displays formulas for a square.

Students will use two different methods to determine the densities of a variety of materials and objects. The first method involves direct measurement of the volumes of objects that have simple geometric shapes, while the second uses the...

Given examples of quadrilaterals and their component parts, the student will use explorations and concrete models to prove a quadrilateral is a parallelogram, rectangle, square, or rhombus using opposite sides, opposite angles, or...

Get the definition and properties of a polygon. Then explore such topics as: 1) types of polygon 2) area 3) Perimeter 4) angles associated with polygons and 5) names of polygons.

Mattie and her four sisters are visiting a toy store. Can you help them find different shapes in the toy store?

Based off of the hit television show NUMB3RS, this lesson shows students different ways to find centroids of regular polygons. The traditional way (using medians) is presented, as well as the triangulation method, the diagonals method,...

In these problems, students are asked to find: point of intersection of two lines; coefficients that make two lines parallel; intersection of diagonals of a quadrilateral; and the point of intersection of three planes.

In this activity, students use the Pythagorean theorem to compute the diagonals of rectangles.

An area problem involving diagonals of a tiled floor.

How would you translate 'Hogwarts' or 'Diagon Alley' or even 'Harry Potter'? Vox explains some of the very specific pitfalls of trying to translate J.K. Rowling's Harry Potter series. [5:54]