Interactive
Calculator Soup

Calculator Soup: Conical Frustum Calculator

For Students 9th - 10th
This online calculator will calculate the various properties of a conical frustum given the 2 radii and any 1 other known variable.
eBook
Internet History Sourcebooks Project

Fordham University: Medieval Sourcebook: The Fatimid Royal Family

For Students 9th - 10th
Fordham University offers an extensive description of all the wealth and properties amassed by the Fatamid Family during their reign in Cairo.
Activity
Paul Dawkins

Paul's Online Notes: Algebra Cheat Sheet [Pdf]

For Students 6th - 8th
An algebra "cheat sheet" to use as a reference when completing algebra homework. Lists basic facts, properties, operations, formulas, and functions, as well as common errors.
Interactive
Quia

Quia: Geometric Terms Concentration

For Students 3rd - 8th
Do you need practice remembering or learning different geometry vocabulary words and definitions? This concentration game is the web site for you! There is a link to a list of terms with definitions you can click if you want to see if...
Interactive
Quia

Quia: Geometric Terms Word Search

For Students 3rd - 8th
Do you need practice remembering or learning different geometry vocabulary words and definitions? This word search is the web site for you! There is a link to a list of terms with definitions you can click if you want to see if you are...
Unknown Type
Khan Academy

Khan Academy: Quiz: Inscribed Quadrilaterals

For Students 9th - 10th Standards
Use the fact that opposite angles in an inscribed quadrilateral are supplementary to solve a few problems. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.
Activity
Texas Instruments

Texas Instruments: Angles Formed by Intersecting Chords, Secants, and Tangents

For Teachers 9th - 10th Standards
In this activity, students will investigate properties of angles and arcs formed when chords, secants, and tangents intersect and intercept arcs in a circle. They discover several important theorems concerning circles and arc sizes. They...
Lesson Plan
Khan Academy

Khan: Lesson 16: Part 2 Coordinate Geometry; Trigo and Radians; Complex Numbers

For Teachers 9th - 10th Standards
2 OF 2 FOR ADDITIONAL TOPICS IN MATH. Students will use the coordinate plane and equations of lines and circles to describe figures; create the equation of a circle given the figure or use the structure of a given equation to determine a...
Activity
Texas Instruments

Texas Instruments: Inscribed Angles Intercepting the Same Arc

For Teachers 9th - 10th Standards
Students investigate the properties of angles inscribed in a circle. They use the drawing and measurement tools of Cabri Jr. to draw and measure certain angles, and establish the relationship between angles that intercept the same arc.
Unit Plan
Analyze Math

Analyze Math: Regular Polygons

For Students 9th - 10th Standards
The interactive tutorial examines the properties and formulas of regular polygons, inscribed circles, and circumscribed circles.
Lesson Plan
Illustrative Mathematics

Illustrative Mathematics: G Srt, G Mg How Far Is the Horizon?

For Teachers 9th - 10th Standards
Some friends are at the beach looking out onto the ocean on a clear day and they wonder how far away the horizon is. A second problem asks how far the horizon would be from the top of a mountain. Learners must also answer a question...
Handout
The Math League

The Math League: Figures and Polygons

For Students 3rd - 8th Standards
This website has basic definitions for most polygons, regular and irregular.
Unit Plan
Khan Academy

Khan Academy: Name Shapes 3

For Students K - 1st Standards
Practice identifying circles, triangles, squares, rectangles, rhombuses, trapezoids, and hexagons. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.
Graphic
Curated OER

Unesco: China: Fujian Tulou

For Students 9th - 10th
Fujian Tulou is a property of 46 buildings constructed between the 15th and 20th centuries over 120 km in south-west of Fujian province, inland from the Taiwan Strait. Set amongst rice, tea and tobacco fields the Tulou are earthen...
Handout
Other

Platonic Realms: Conics

For Students 9th - 10th Standards
This resource provides in depth information on the conic sections. Click on the underlined words for definitions and diagrams.
Graphic
Curated OER

Unesco: Russian Federation: Putorana Plateau

For Students 9th - 10th
This site coincides with the area of the Putoransky State Nature Reserve, and is located in the central part of the Putorana Plateau in northern Central Siberia. It is situated about 100 km north of the Arctic Circle. The part of the...