Handout
Math Open Reference

Math Open Reference: Alternate Interior Angles

For Students 9th - 10th
Explore the triangle inequality theorem with this helpful reference tool. Provides a detailed definition and an interactive activity that enhances further explanation. Includes links to related topics.
Lesson Plan
Illustrative Mathematics

Illustrative Mathematics: G C Right Triangles Inscribed in Circles I

For Teachers 9th - 10th Standards
This task provides a good opportunity to use isosceles triangles and their properties to show an interesting and important result about triangles inscribed in a circle with one side of the triangle a diameter. The fact that these...
Handout
Math Open Reference

Math Open Reference: Pythagorean Theorem

For Students 9th - 10th Standards
Learn about corresponding angles with this resource which offers detailed explanations, examples, and an interactive. Subjects covered include finding the right triangle. Links to related topics.
Handout
Math Open Reference

Math Open Reference: Thales' Theorem

For Students 9th - 10th
Learn about Thales' Theorem with this handy reference guide. Provides a detailed definition, examples, and an interactive activity that enhances further explanation. Includes links to related topics.
Handout
Math Open Reference

Math Open Reference: Polygons

For Students 9th - 10th
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.
Handout
Math Open Reference

Math Open Reference: Introduction to Trigonometry

For Students 9th - 10th
An introductory reference guide to trigonometry. It provides definitions and examples that enhance further explanation. Includes links to related topics.
Handout
Math Open Reference

Math Open Reference: Acute Triangle

For Students 9th - 10th Standards
Explore acute triangles with this handy reference guide. Provides a detailed definition and an interactive activity that enhances further explanation. Includes links to related topics.
Handout
Math Open Reference

Math Open Reference: Heron's Formula

For Students 9th - 10th
Learn about corresponding angles with this resource which offers detailed explanations, examples, and interactives. Subjests covered include the area of a triangle. Links to related topics.
Handout
Math Open Reference

Math Open Reference: Interior Angles of a Triangle

For Students 9th - 10th
Learn about the interior angles of a triangle with this helpful reference tool. Provides a detailed definition and interactive activity that enhances further explanation. Includes links to related topics.
Handout
Math Open Reference

Math Open Reference: Full Angle

For Students 9th - 10th Standards
Explore full angles triangles with this handy reference guide. Provides a detailed definition and an interactive activity that enhances further explanation. Includes links to related topics.
Handout
Math Open Reference

Math Open Reference: Reflex Angle

For Students 9th - 10th Standards
Explore reflex angles triangles with this handy reference guide. Provides a detailed definition and an interactive activity that enhances further explanation. Includes links to related topics.
Handout
Math Open Reference

Math Open Reference: Points of Concurrency

For Students 9th - 10th
Learn about points of concurrency with this handy reference guide. Provides a detailed definition and examples that enhance further explanation. Includes links to related topics.