Scholastic
Scholastic: Setting the Stage With Geometry
Students will learn and reinforce skills for measuring perimeter and area of 2D shapes and measuring surface area and volume of 3D shapes.
CK-12 Foundation
Ck 12: Interactive Geometry: 1.11 Surface Area and Nets
Explore surface areas and nets with 2D and 3D shapes.
Better Lesson
Better Lesson: Making New Shapes With Shapes
My first graders have been studying the defining attributes of 2D shapes. They are going to love using toothpicks and marshmallows to present their knowledge of 2D and create 3D shapes.
National Council of Teachers of Mathematics
Nctm: Illuminations: Geometric Solids
An interactive game to find number of edges, surfaces and vertices of different geometric shapes.