Geometry Foundations · Level 1
Digital Tools for Every Lesson
Free online tools that match each lesson in Level 1: Measure & Decompose. Use them alongside the book, or in place of physical rulers, protractors, cubes, and nets when you don't have them on hand.
Chapter 1Geometry Vocabulary & Angle Basics
- 1.1
Points, Lines, Segments & Rays
GeoGebra Geometry: point, line, ray, segment, and midpoint tools.
- 1.2
Rays, Planes & Geometry Notation
GeoGebra 3D Calculator: planes and a labeled box.
- 1.3
Measuring & Drawing Angles
Polypad protractor and ruler; GeoGebra angle tool.
- 1.4
- 1.5
Parallel, Perpendicular & Intersecting Lines
GeoGebra parallel and perpendicular line tools; 3D Calculator for skew lines.
- 1.6
Classifying Triangles & Quadrilaterals
Polypad geoboard; GeoGebra polygon tool.
Chapter 2Area of Polygons
- 2.1
- 2.2
Area of Parallelograms
GeoGebra applets that cut and slide a parallelogram; Polypad geoboard.
- 2.3
- 2.4
Area of Trapezoids, Rhombuses & Kites
Polypad geoboard; GeoGebra trapezoid and kite applets.
- 2.5
- 2.6
Area in the Real World
Desmos calculator or a spreadsheet for cost problems.
Chapter 3Measurement & Unit Conversion
- 3.1
Converting Units with Ratios
Polypad number lines (as double number lines); online unit converter for checking.
- 3.2
- 3.3
Choosing Sensible Units and Precision
Polypad ruler; photos of objects next to a ruler.
Chapter 4Nets & Surface Area
- 4.1
Three-Dimensional Figures
GeoGebra 3D Calculator: prisms and pyramids.
- 4.2
Nets of Solid Figures
GeoGebra nets applets (fold and unfold solids); Polypad polyhedra nets.
- 4.3
Surface Area of Prisms
GeoGebra 3D Calculator nets of prisms.
- 4.4
Surface Area of Pyramids
GeoGebra 3D Calculator nets of pyramids.
Chapter 5Volume of Rectangular Prisms
- 5.1
Volume and Unit Cubes
Polypad isometric cube drawings; NCTM Isometric Drawing Tool.
- 5.2
Volume Formulas
GeoGebra 3D Calculator boxes with sliders for length, width, and height.
- 5.3
Volume with Fractional Edges
Polypad isometric cubes scaled to ½-unit edges.
- 5.4
Chapter 6The Coordinate Plane
- 6.1
The Coordinate Plane
Desmos graphing calculator (plot points); GeoGebra Graphing.
- 6.2
- 6.3
- 6.4
Polygons on the Coordinate Plane
Desmos Geometry or GeoGebra polygon tool on a grid.
- 6.5
Area on the Coordinate Plane
Desmos Geometry or GeoGebra polygon and area tools.