# Geometry

This geometry section will help your child to become familiar with the basic concepts of planes, spaces, points, lines, the x-y-z coordinate system, angles, circle geometry, perimeters, area, and volume.

Note: Each of the sub-sections listed below includes a listing of related geometry worksheets for practice with the concepts.

## What is in the geometry section?

General
##### Geometry Worksheets

Practice with almost 100 geometry, each with optional answer sheet.

##### Terms & Definitions

Define geometry terms. e.g. those associated with lines, angles, triangles, etc.

##### Formulas & Equations

View a listing of common geometry formulas. e.g. for calculating circumference, area, and volume.

Shapes and Figures
##### 2D Shapes

See descriptions and illustrations of various 2D Shapes. e.g. polygons, triangles, parallelograms.

##### 3D Shapes

View illustrations of common 3D shapes such as pyramids, cones, cylinders, spheres, etc.

Discover the properties of special types of quadrilaterals including the Rhombus and the Kite.

Lines and Angles
##### Measuring Angles

Take a foundation lesson on angles that illustrates how angle measurement is related to parts of a circular rotation.

##### Using a Protractor

Learn how to use a protractor to measure angles and draw angles.

##### Angle Properties

Explore the relationships between supplementary, corresponding, and alternate angles

##### Finding Angles

Find "missing angles" by using the relationships between angles formed by various shapes.

##### Symmetry

Try the lesson on lines of symmetry with activities and worksheets to develop and understanding of symmetry.

Area and Volume
##### Area

Calculate area of different shapes and learn about of the various associated units of measurement.

##### Volume

Use formulas to calculate the volume of rectangular prisms, cylinders, cones, and spheres.

##### Surface Area

Discover how nets are used to help understand and calculate the surface area of 3D shapes.

##### Perimeter

Find the perimeter of various shapes including rectangles, squares, and other polygons.

Coordinate System
##### Coordinate System

Explore how x and y-axes on a grid are used to locate the coordinates of ordered pairs.

##### Coordinate Graphing

Graph coordinate pairs representing real-world linear relationships.

Pythagorean Theorem
##### Pythagoras' Theorem

Calculate the length of a right-triangles sides using Pythagoras' Theorem.

##### Distance Between Two Points

Find the distance between two points given two coordinates.

Congruence, Similarity & Transformations
##### Congruent Triangles

Get started with transformations with a lesson on congruence of triangles and other shapes.

##### Similar Triangles

Understand the concept of similarity with triangles and other similar shapes.

##### Transformations

Take a lesson on transformations including translations, rotations, and reflections.

##### Dilations

Transform the size of shapes with dilations calculate and plot transformations on a Cartesian plane.

You will find a printable graph paper generator here that will assist when working with some of the examples in this section.

All Geometry 24 Worksheets Terms/ Definitions Formulas/ Equations 2D Shapes Defining Attributes 3D Shapes Quadrilaterals Measuring Angles Using a Protractor Adding and Subtracting Angles Angle Properties Finding Angles Symmetry Area Volume Surface Area Perimeter Coordinate System Coordinate Graphing Pythagoras' Theorem Distance Between Two Points Congruent Triangles Similar Triangles Transformations Dilations