# Math

### Identifying Divisibility by Looking at the Final Digits

You can tell whether a number is divisible by 2, 5, 10, 100, or 1,000 simply by looking at...

In Algebra

### Sizing Up the Area of a Polygon

Not only can polygons be classified by the number of sides they have and by their angles,...

In Geometry

### How to Copy an Angle Using a Compass

The basic idea behind copying a given angle is to use your compass to sort of measure how...

In Geometry

### How to Copy a Line Segment Using a Compass

The key to copying a given line segment is to open your compass to the length of the segme...

In Geometry

### How to Find the Right Angle to Two Points

If you’re given two points on the coordinate plane, you can find the locus of points...

In Geometry

### Find the Locus of Points Equidistant from Two Points

If you’re given two points, and you’re asked to find the locus of points equid...

In Geometry

### How to Solve a Two-Dimensional Locus Problem

In two-dimensional locus problems, all the points in the locus solution lie in a plane. Th...

In Geometry

### Find the Main Reflecting Line of a Glide Reflection

A glide reflection involves three reflections, and so it can be challenging to find the lo...

In Geometry

### How Glide Reflections Work

A glide reflection is just what it sounds like: You glide a figure (that’s just anot...

In Geometry