The word "geometry" comes from the ancient Greek for "earth measurement." Geometry is about understanding the shape, size, and position of things in the world. While you're studying this subject, you learn about where things are and how to describe them. Some of the most important ideas in geometry that will help you as you move into higher grades are measurement, shapes, lines and angles, and perimeter and area. Measurement tells you how long, wide, or heavy something is. You might use centimeters, inches, feet, or other units. The study of shapes includes 2D and 3D figures. Two-dimensional, or 2D, shapes are flat. They are the pictures you draw on a sheet of paper. Three-dimensional, or 3D, shapes have a width, length, and height. They are part of the world around you. Lines and angles help you understand shapes and direction. Perimeter and area attach numbers to the sizes of shapes: Perimeter shows how big the outside of something is, telling you how long of a string you would need to wrap tightly around the shape, and area finds out how much space it takes up, like how many little squares you can fit in a shape. The activities below can give you plenty of practice solving math problems about these ideas. You'll measure and weigh packages at a post office, sort flat 2D and solid 3D shapes, build robots by calculating the perimeter of different shapes, and more!
- Alien Angles: In this game, you estimate angles to help aliens find their way home.
- Area Builder: Explore the perimeter and area of different shapes, or play the game to build a shape with the right area.
- Classifying Angles and Triangles: Try these activities to learn about different types of angles and triangles.
- Finding the Area of a Shape: Figure out the areas of the shapes to earn stars and move up levels.
- Types of Angles: Practice naming different types of angles, including acute, right, and obtuse angles.
- Interactive Quadrilaterals: A quadrilateral is a shape that has four sides. Learn about the basic quadrilaterals here and play with some of your own.
- Lines, Line Segments, and Rays: Test your knowledge of these three simple geometry concepts.
- Line Splat: In this arcade-style game, choose between Relaxed Mode and Timed Mode to test yourself on points, line segments, rays, and lines.
- Monster Mansion Shape Match: Peer into the windows of the mansion, where little monsters are smiling back with shapes and words on their tummies. Match objects to shapes and words to shapes to practice your geometry skills.
- Parallel and Perpendicular Lines: Watch a fun video to find out what parallel and perpendicular lines are.
- Parcel Measurement Game: Measure and weigh the packages to find the right stamps to deliver them.
- Perim-Bots: Put together the six parts of your robot by answering questions about perimeter correctly.
- Perimeter Climber: Move the climber up the ladder by choosing the shape that has the perimeter you're asked to find.
- Sammy's Symmetry Shuffle: Sammy the Starfish needs your help making both sides of the screen symmetrical. Drag the shapes so that the picture matches the pattern on the other side of the dotted line.
- Shape Tool: Create any shape you want by changing and gluing together shapes, triangles, squares, and other polygons.
- Symmetry Sorting: Choose pictures, shapes, or letters to sort between symmetrical and not symmetrical.
- 2D and 3D Shape Matching: Drag the 2D and 3D shapes over the real-life objects that match them.
- Using a Protractor: Try this game to help you learn how to use a protractor to find different angles.