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### Hide and Delete Objects in Cabri Jr.

You can hide and delete objects in the Cabri Jr. geometry application for the TI-84 Plus graphing calculator. There is a big difference between hiding and deleting an object. If you [more…]

### How to Reflect Geometric Objects in Cabri Jr.

Cabri Jr. for the TI-84 Plus calculator allows objects to be reflected in a line or a segment. When a geometric object is reflected in a line, that line acts like a mirror — hence the term “reflection. [more…]

### Tile the Plane in GeoMaster on the TI-84 Plus

The **Symmetry** tool in the **TRFM** menu on the TI-84 Plus calculator can be used to tessellate (tile) the plane with a geometric figure by rotating that object 180 degrees about a specified point. Unlike the [more…]

### Rotate Geometric Objects with the TI-84 Plus

When a geometric object is rotated, it is rotated about a given point through a given angle. To use GeoMaster on the TI-84 Plus graphing calculator to rotate an already constructed geometric object, follow [more…]

### Making Geometry Easier

The page you are looking for was recently moved. Don't worry, it's still here; it just has a new address: http://www.dummies.com/how-to/content/simple-and-easy-geometry-tips-and-tools.html [more…]

### Math iPads and Hunting for Geometric Shapes

Teachers can use iPads in their geometry classrooms to encourage students to apply mathematical concepts to real world examples. By creating presentations on their iPads [more…]

### Math Topics to Study for the Miller Analogies Test (MAT)

Math: it really is everywhere, even the MAT. If you don’t like math, don’t worry: The Miller Analogies Test doesn’t require you to do a lot of calculation. But you do have to know a few things about the [more…]

### Geometry Practice Problems with Triangles and Polygons

A *polygon* is a geometric figure that has at least three sides. The triangle is the most basic polygon. You will find the following formulas and properties useful when answering questions involving triangle [more…]

### Coordinate Geometry Formulas

Coordinate geometry is the study of geometric figures graphed on a coordinate plane. The slope formula can be used to determine whether lines are parallel or perpendicular. The midpoint can be used to [more…]

### Circle Basics for Geometry Problems

To solve geometry problems about circles, you will need to know the following circle theorems involving tangents, secants, and chords. These theorems can be used to find information about angles, intercepted [more…]

### Formulas for Geometric Solids Problems

Many formulas are associated with the study of three-dimensional shapes in geometry. Here, you find formulas for calculating the volume, surface area, and lateral area of cylinders, cones, spheres, pyramids [more…]

### Transformation Rules for Geometry Problems

In coordinate geometry problems, there are special rules for certain types of transformations. To determine the image point when performing reflections, rotations, translations and dilations, use the following [more…]

### 1,001 Geometry Practice Problems For Dummies Cheat Sheet

Geometry is full of formulas, properties, and theorems. You can become successful in geometry by remembering the most important ones and learning how to apply them. Use this reference sheet as you practice [more…]

### Inscribed Angles and Arcs — Practice Geometry Questions

In geometry, when you have an inscribed angle on a circle, the measure of the inscribed angle and the length of the intercepted arc are related.

An inscribed angle is equal to half of the intercepted arc [more…]

### Angles That Form Linear Pairs—Practice Geometry Questions

Angles that form a linear pair combine to form a straight angle. (A straight angle measures 180 degrees.) The following practice questions ask you to solve problems based on linear pairs. [more…]

### Congruent Angle Constructions — Practice Geometry Questions

You can use your knowledge of geometric constructions (as well as a compass and straight edge) to create congruent angles. The following practice questions test your construction skills. [more…]

### Parallel and Perpendicular Lines — Practice Geometry Questions

You can apply your knowledge of geometric constructions to solve a variety of problems. The following practice questions test your ability to construct parallel and perpendicular lines. [more…]

### Constructing 30- and 45-Degree Angles — Practice Geometry Questions

When you deal with geometry problems where you have to construct 30- and 45-degree angles, you may need to do more than one construction to create what the problem is asking for. [more…]

### Proofs and Triangle Congruence Theorems — Practice Geometry Questions

In geometry, you may be given specific information about a triangle and in turn be asked to prove something specific about it. The following example requires that you use the SAS property to prove that [more…]

### Geometric Proofs with Overlapping Triangles — Practice Questions

In geometry, you may be asked to formulate a proof with overlapping triangles. In order to prove parts of a triangle are congruent, you first need to prove that the triangles are congruent to each other [more…]

### Indirect Geometric Proofs — Practice Questions

In an indirect geometric proof, you assume the opposite of what needs to be proven is true. Therefore, when the proof contradicts itself, it proves that the opposite must be true. [more…]

### Triangle Classification Using Sides — Practice Geometry Questions

You can classify equilateral, isosceles, scalene, and right triangles based on their side measurements. The following practice questions ask you to identify a triangle using algebra. [more…]

### Triangle Classification Using Angles — Practice Geometry Questions

You can identify triangles by their angle measurements. Using the fact that all angles in a triangle add up to 180 degrees, you apply some algebra to determine whether a triangle is equiangular, isosceles [more…]

### Triangle Solutions Using the Incenter — Practice Geometry Questions

In geometry, the point in a triangle where the angle bisectors of the triangle intersect is called the *incenter*. The following practice questions test your skills at finding the incenter of a given triangle [more…]

### Orthocenter Coordinates in a Triangle — Practice Geometry Questions

To find the *orthocenter* of a triangle, you need to find the point where the three altitudes of the triangle intersect. In the following practice questions, you apply the point-slope and altitude formulas [more…]