Lesson Plan
Curated OER

Concurrent Lines in Triangles

For Teachers 9th - 12th
Students explore the concept of concurrent lines in triangles. In this concurrent lines in triangles lesson, students work in groups to investigate properties of concurrent lines in acute, right, and obtuse triangles. Students use a...
Worksheet
Curated OER

Concurrent Lines, Medians and Altitudes

For Students 9th - 10th
In this geometry learning exercise, students construct angles and identify medians and altitudes. They use a compass and protractor to perform heir construction. There are 28 questions.
Lesson Plan
Curated OER

Incenter of a Triangle

For Teachers 10th
Tenth graders find the incenter of a triangle. In this geometry lesson, 10th graders define the way to create an incenter with an angle bisector. They differentiate between incenter and incircle.
Worksheet
Curated OER

Analytic Geometry-Good Problems from Alex Pintilie

For Students 10th - 12th
In this analytic geometry worksheet, students solve 12 word problems. Problems cover identifying the locus of an equation as well as the locus.
Worksheet
Curated OER

Quadratic and Linear Functions

For Students 11th
In this Algebra II worksheet, 11th graders review and apply the basic concepts for solving linear and quadratic equation. The one page worksheet contains twelve problems. Solutions are not provided. 
Worksheet
Curated OER

Properties of Quadrilaterals

For Students 9th - 11th
In this properties of quadrilaterals worksheet, students use the properties of quadrilaterals to find the perimeter, angle measurement or length of a missing side of a given polygon. Examples and explanations of the properties are...
Worksheet
Curated OER

Regents Exam Questions G.G.21: Centroid, Orthocenter, Incenter, and Circumcenter

For Students 9th - 12th
In this triangles worksheet, learners solve 4 multiple choice problems. Students find the centroid, orthocenter, incenter, and circumcenter or various triangles.
Lesson Plan
Curated OER

Exercise 23--the Regular Pentagon on a Given Side

For Teachers 6th - 8th
Learners examine and study how to recognize the characteristics of a regular pentagon and demonstrate how to construct one. They become aware of associating a regular pentagon to its term of a double map and practice the concept of line...
Lesson Plan
Curated OER

Polygons All Around Us!

For Teachers 9th - 12th
Students explore the concept of polygon properties. In this polygon properties lesson, students draw polygons with different numbers of sides such as pentagons, octagons, hexagons, etc. Students identify different geometric shapes in the...
Worksheet
Curated OER

Quadrilateral Explorations

For Students 9th
In this geometry worksheet, 9th graders classify quadrilaterals by using coordinate geometry and the properties of various quadrilaterals. The seven page worksheet contains eleven questions. Answers are...
Lesson Plan
Curated OER

Diagonals of Quadrilaterals

For Teachers 9th - 10th
Students find the diagonals of the quadrilaterals. In this geometry lesson plan, students identify and use properties of quadrilaterals. They define different parts of a quadrilateral shape.
Lesson Plan
Curated OER

Diagonals to Quadrilaterals II

For Teachers 8th - 10th
Learners identify the properties of different polygons. In this geometry lesson, students find the slope of a line and calculate the distance between two lines. They differentiate between similar and congruent polygons.
Worksheet
Curated OER

Geometry, Word Search Puzzle

For Teachers 6th - 8th
In this math worksheet, students look for the words that are related to the math words used in the practice of geometry. They also practice spelling.
Handout
Wolfram Research

Wolfram Math World: Perpendicular Bisector

For Students 9th - 10th Standards
MathWorld's definition of a perpendicular bisector, with illustrations to show the different uses of the perpendicular bisector.
Activity
Texas Instruments

Texas Instruments: Perpendicular Bisector of a Line Segment

For Teachers 9th - 10th Standards
Students learn to draw a segment and its perpendicular bisector. They understand right angles and congruent segments. Students observe that changing the length or orientation of the segment changes the perpendicular bisector.
Lesson Plan
Illustrative Mathematics

Illustrative Mathematics: G Co Construction of Perpendicular Bisector

For Teachers 9th - 10th Standards
A and B are two distinct points in the plane and line AB is the segment joining them. The goal of this problem is to construct the perpendicular bisector of segment AB. Aligns with G-CO.D.12.
Handout
Math Open Reference

Math Open Reference: Perpendicular Bisector

For Students 9th - 10th Standards
Learn about the perpendicular bisector with this handy reference guide. Provides a detailed definition, examples, and an interactive activity that enhances further explanation.
Activity
Texas Instruments

Texas Instruments: Points on the Perpendicular Bisector of a Segment

For Teachers 9th - 10th Standards
In this activity, students use the drawing and measurement tools of Cabri Jr., to learn and understand the concept of "equidistant from the endpoints of a segment." They observe the changes if they move a point on the perpendicular...
Activity
Texas Instruments

Texas Instruments: Investigate Perpendicular Bisector

For Teachers 9th - 10th Standards
Student activity: Discover that any point on the perpendicular bisector of a segment is equidistant from the endpoints of the segment.
Activity
Analyze Math

Analyze Math: Perpendicular Bisector

For Students 9th - 10th Standards
Learners explore the definitions and properties of the perpendicular bisector. The interactive activity includes an applet to explore the properties of the perpendicular bisector.
Unit Plan
CK-12 Foundation

Ck 12: Geometry: Perpendicular Bisectors

For Students 9th - 10th
[Free Registration/Login may be required to access all resource tools.] Apply perpendicular bisector properties.
Unit Plan
CK-12 Foundation

Ck 12: Geometry: Perpendicular Bisectors

For Students 9th - 10th
[Free Registration/Login may be required to access all resource tools.] This concept teaches students how to construct perpendicular bisectors and use the Perpendicular Bisector Theorem.
Article
Mocomi & Anibrain Digital Technologies

Mocomi: Perpendicular Bisector: Definition & Theorem

For Students 6th - 8th
Explains how to draw a perpendicular bisector and provides a definition of the perpendicular bisector theorem.
Activity
Texas Instruments

Texas Instruments: Cabri Jr. Perpendicular Bisector of a Circle

For Teachers 9th - 10th
This activity uses Cabri Jr. to discover that the perpendicular of a chord passes through the centre of a circle. Microsoft Word documents are attached to support the lesson.

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