Math Open Reference
Math Open Reference: Parallel Lines
Get the definition for parallel lines and explore angles associated with parallel lines.
Math Open Reference
Math Open Reference: Plane Geometry: Transformations
Explore transformations of a polygon that include: 1) translation 2) rotation 3) reflection and 4) dilation.
Math Open Reference
Math Open Reference: Thales
Contains a detailed biography and discussion of the contributions of the ancient Greek philosopher Thales. Part of a larger mathematics site, this page focuses primarily on his contributions to Geometry.
Math Open Reference
Math Open Reference: Math / Scientific Calculator
This online scientific/math calculator supports functions for algebra and trigonometry. Operates using both the keys on the computer keyboard or pressing the keys on the calculator with the mouse or a combination of both.
Math Open Reference
Math Open Reference: Cube
Explore this 3D cube. Use the 'explode' slider to separate the faces.
Math Open Reference
Math Open Reference: Biography of Euclid
Biography of Euclid, a Greek Mathematician, also known as the 'Father of Geometry'.
Math Open Reference
Math Open Reference: Constructions
Learn about drawing shapes using only a compass and straight edge or ruler with out measuring any lengths or angles.
Math Open Reference
Math Open Reference: Polygons
Get the definition and properties of a polygon. Then explore such topics as: 1) types of polygon 2) area 3) Perimeter 4) angles associated with polygons and 5) names of polygons.
Math Open Reference
Math Open Reference: Angles
Everything you wanted to know about angles and more, including 1) how to measure angles 2) types of angles 3) angle relationships and 4) angles around a transversal.
Math Open Reference
Math Open Reference: Ratio
Learn about ratios with this handy reference site. Detailed explanations and examples are used to explain ratios. Also highlights common mistakes that can be made when learning about ratios.
Math Open Reference
Math Open Reference: Percent
Explore percents with this easy reference guide. Learn how to convert fractions to percents and percents to fractions. Try the sliding bar to see how a percentage is calculated. Detailed explanations and examples are included.
Math Open Reference
Math Open Reference: Solid Geometry
A complete reference guide to solid geometry. The mathematics resource provides definitions and interactive activities that enhance further explanation.
Math Open Reference
Math Open Reference: Equations of a Line (Slope and Intercept Form)
The interactive resource investigates slope and intercept. Students adjust the sliders to control the slope (m) and the intercept (b) of the line. The equation and the line will change accordingly. Learners can also drag the origin.
Math Open Reference
Math Open Reference: Similar Polygons and Triangles
A complete reference guide to similar triangles and polygons. It provides definitions and interactive activities that enhance further explanation.
Math Open Reference
Math Open Reference: Ellipses
Complete reference source for information on ellipses. Provides definitions and interactive activities that will enhance further explanation.
Math Open Reference
Math Open Reference: Quadrilaterals
A complete reference guide to quadrilaterals including squares, rectangles, parallelograms, trapezoids, and rhombus. It provides definitions and interactive activities that enhance further explanation.
Math Open Reference
Math Open Reference: Parallelogram: (Coordinate Geometry)
Students are able to manipulate a parallelogram on a coordinate grid to explore properties of a parallelogram and then calculate the distance of the sides, altitude, and area. The resource also includes links to further explain important...
Math Open Reference
Math Open Reference: Volume of a Triangular Prism
Use this interactive tool to find the volume of a triangular prism. Try different figures for the height and the dimensions of the triangular face to see how these affect the volume. An accompanying chart also presents five methods for...
Math Open Reference
Math Open Reference: Surface Area of a Right Prism
Use this interactive tool to find the surface area of a right prism. Try different figures for the height and the dimensions of the prism to see how these affect the surface area. Properties of right prisms are explained, how to use a...
Math Open Reference
Math Open Reference: Volume of a Pyramid
Use this interactive tool to find the volume of a pyramid. Try different figures for the height and the base to see how these affect the volume. Properties of pyramids are explained, how to calculate the volume using a formula, what an...
Math Open Reference
Math Open Reference: Surface Area of a Pyramid
Use this interactive tool to find the surface area of a pyramid. Try different figures for the height and the base to see how these affect the area. Properties of a pyramid are discussed, how to use a formula to calculate the surface...
Math Open Reference
Math Open Reference: Cone
Use this interactive tool to explore cones. Change the height and the radius to see how these affect the cone. There is also the option of making an oblique cone. Properties of a cone are discussed, how to use formulas to calculate the...
Math Open Reference
Math Open Reference: Prism
Use this interactive tool to explore prisms. Change the height and the shape of the base to see how these affect the prism. There are also several additional options, e.g., making it oblique or transparent. Properties of a prism are...
Math Open Reference
Math Open Reference: Pyramid
Use this interactive tool to explore pyramids. Rotate the pyramid to view it from all sides. Increase the number of sides (even to well over 100) until it closely resembles a cone. The base can be made irregular and you can 'explode' the...