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http://teachingcommons.cdl.edu/mec/teacher_resources/GeometryResources.htm - Teacher and Student resources

http://mathbits.com/MathBits/TeacherResources/Geometry/Geometry.htm - Instructional guides for teachers

http://mathforum.org/geometry/k12.geometry.html - SO MANY resources

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https://www.education.com/activity/geometry/ - Activities for Kids

http://nlvm.usu.edu/en/nav/topic_t_3.html - Virtual Manipulatives

http://mathbits.com/MathBits/TeacherResources/Geometry/Geometry.htm - Games for students

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Definitions and categories help students focus on properties that define the shape and not just what it looks like. One great activity is to have students construct shapes out of materials like toothpicks and marshmallows. Construction Activities help students focus on the attributes and components that are central to defining each shape through the making of physical models.

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Transformations are changes in position or size of a shape. This concept is a major focus of 8th grade in the Common Core State Standards. It includes: symmetry, rigid motions, congruence, and similarity.

Tessellations are a motivating and artistic application of transformations. A great way to have students create their own tessellations can be found in NCTM's Illumination website through a tool called "Tessellation Creator."

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Website provides ideas on how to teach geometry using the Van Hiele Levels http://www.mathgiraffe.com/blog/teaching-geometry-for-deeper-understanding-using-the-5-van-hiele-levels

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Geometry, measurement, and algebra are all supported by the use of a grid system with numbers or coordinates attached that can specify location. Students at the primary level can begin to think in terms of a grid system to identify location. After early development of terms for how objects are located with respect to other objects

Website provides activities and lesson plans for Geometry instruction.
https://www.exploratorium.edu/geometryplayground/resources.php

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It involves being able to create mental images of shapes and then turn them around mentally, thinking about how they look from different viewpoints and predicting the results of various transformations.

A great way for students to visual geometry is by origami.
http://www.learnnc.org/lp/pages/3841

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Show a variety of shapes and have students compare both examples and nonexamples with a focus on critical characteristics.

Facilitate student discussions about the properties of shapes, having them develop essential language along the way.

Encourage the examination of an array of shape classes that goes beyond the traditional, allowing students to explore relationships and recognize different categories, orientations, and sizes.

Provide students with a range of geometric experiences at every level, having them use physical materials, drawings, and computer models.