Activity
Illustrative Mathematics

Find the Missing Angle

For Teachers 7th - 9th Standards
This one activity requires young geometers to pull together information they are currently learning with things they have learned previously. Here they rely on understanding something about parallel lines, alternative interior angles,...
Activity
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Illustrative Mathematics

Midpoints of the Sides of a Paralellogram

For Teachers 9th - 12th Standards
This task asks learners to prove that the segment joining the midpoints of two sides of a parallelogram is both congruent and parallel to an adjacent side of the parallelogram. The activity would be good to use in a discussion about how...
Activity
Curated OER

Task: Miniature Golf

For Teachers 6th - 10th Standards
"Fore!" All right, no one really yells this out in miniature golf, but this well-defined activity will have your charges using lots of numbers in their unique design of a miniature golf hole. Included in the activity criteria is the...
Lesson Plan
Illustrative Mathematics

Base and Height

For Teachers 5th - 7th Standards
It is easy to find the area of a triangle where the base and the height are given. But in this resource, it is up to your geometers to identify the base and height of the triangle. In fact, your pupils will learn that there are three...
Activity
Texas Instruments

Texas Instruments: Angles of a Triangle

For Teachers 9th - 10th
In this activity, students will measure angles and investigate the relationships between interior and exterior angles of a triangle. They understand the definition of interior angles, exterior angles, adjacent angles, supplementary...
Activity
Texas Instruments

Texas Instruments: Angles Formed by Two Intersecting Lines

For Teachers 9th - 10th Standards
Students will investigate the properties of angles formed by intersecting lines. They examine the definition of adjacent angles, supplementary angles, and vertical angles and learn about two important geometric theorems dealing with...
Activity
Shodor Education Foundation

Shodor Interactivate: Angles

For Students 9th - 10th Standards
This activity from Shodor Education Foundation will help you learn or review your angle vocabulary.
Activity
Texas Instruments

Texas Instruments: Vertical, Adjacent, and Supplementary Angles With Cabri Jr.

For Teachers 9th - 10th
Study Vertical, Adjacent, and Supplementary Angles with Cabri Jr. Page numbers come from Prentice Hall Geometry textbook.
Activity
Other

800score: Intersecting Angles

For Students 9th - 10th Standards
Read a description of intersecting lines and all about the different kinds of angles they form. Includes examples.
Activity
Math2

Math2.org: Trigonometry Functions

For Students 9th - 10th Standards
A complete look at trig functions. From an "overview," page giving general definitions and important vocab words, to a listing of the 12 trig functions, to an explanation of the three modes used in trigonometry, to the procedures of how...
Activity
Texas Instruments

Texas Instruments: Numb3 Rs: Telling Time With the Sun

For Teachers 9th - 10th
Based off of the hit television show NUMB3RS, this activity is a very basic introduction to the tangent function and it's applications (such as measuring distances). Through this lesson, students will learn the definition of the tangent...
Activity
Oswego City School District

Regents Exam Prep Center: Special Right Triangles

For Students 9th - 10th
A collection of lessons, practice activities, and a teacher resource that will aid your exploration and understanding of special right triangles.
Activity
Ministry of Education and Universities of the Region of Murcia (Spain)

Ministerio De Educacion Y Ciencia: Homotecia Y Semejanza

For Students 9th - 10th Standards
In Spanish. In this interactive activity you can understand and know how to apply direct and inverse homothety to simple shapes, apply Thale's theorem, construct similar polygons and work out their related measurements and know how to...

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