Lesson Plan
Curated OER

Solving Intercepted Arcs

For Teachers 9th - 11th
Learners investigate circles and its arcs. In this geometry lesson plan, students identify the relationship between an circle and its intercepted arcs. THey identify the central and inscribed angles.
Lesson Plan
Curated OER

Circles and Angles

For Teachers 9th - 11th
Students identify tangents, chords and secants. In this geometry lesson, students graph circles and identify angles created by secant lines, tangent lines and chords.
Instructional Video13:36
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Flipped Math

Unit 11 Review: Circles

For Students 9th - 12th Standards
Solve problems around a circle. Pupils watch a video that shows how to apply concepts about circles and related angles and segments to find solutions to word problems. Learners then review the different concepts from the unit in...
Worksheet
Curated OER

Area of Sectors

For Students 10th - Higher Ed
In this area of sectors worksheet, students find the area of a given sector, area of inscribed figures, and area of shaded regions. This two-page worksheet contains 20 problems. An answer sheet is provided on the third page.
Lesson Plan
Curated OER

Relationships Among Arc and Angle Measures in Circles

For Teachers 9th - 12th
Students follow the directions on the attached worksheet to construct shapes using Geometer's Sketchpad. To start the lesson, it is suggested that the teacher guide the students through the initial problem. When constructions are...
Assessment
EngageNY

Geometry Module 5: Mid-Module Assessment

For Teachers 9th - 12th Standards
How can you formally assess understanding of circle concepts? Pupils take a mid-module assessment containing five questions, each with multiple parts.
Assessment
EngageNY

Geometry Module 5: End-of-Module Assessment

For Teachers 9th - 12th Standards
The lessons are complete. Learners take an end-of-module assessment in the last installment of a 23-part module. Questions contain multiple parts, each assessing different aspects of the module.
Lesson Plan
Curated OER

Inscribed Quadrilaterals and Parallelograms

For Teachers 9th - 10th Standards
Learners differentiate between inscribed quadrilaterals and parallelograms. In this geometry lesson, students identify the shaped of the polygons when it is inscribed inside of a circle. They calculate the missing angles of the inscribed...
Lesson Plan
Curated OER

Solving Problems Involving Chords, Radii, Tangents, Secants and Arcs within the Same Circle

For Teachers 10th
Tenth graders apply their knowledge of angles related to a circle, radii, secants, tangents and chords of a circle. They practice using formulas related to a circle. They also apply what has been practiced to real life situations.
Lesson Plan
EngageNY

Similar Triangles in Circle-Secant (or Circle-Secant-Tangent) Diagrams

For Teachers 9th - 12th Standards
First angle measures, now segment lengths. High schoolers first measure segments formed by secants that intersect interior to a circle, secants that intersect exterior to a circle, and a secant and a tangent that intersect exterior to a...
Worksheet
Curated OER

Circles Terminology Multiple Choice

For Students 9th - 12th
In this circles learning exercise, students solve 10 multiple choice problems. Students answer questions about diameter and chord relationships, tangent lines to a circle, circumference, the Pi relationship, etc.
Lesson Plan
Curated OER

Circle Packing

For Teachers 9th - 10th
Students identify different parts and properties of circles. In this geometry lesson, students identify the radius, diameter, semicircle and inscribed angle of a circle. They identify the tangent lines to a circle.
Lesson Plan
EngageNY

Secant Lines; Secant Lines That Meet Inside a Circle

For Teachers 9th - 12th Standards
Young mathematicians identify different cases of intersecting secant lines. They then investigate the case where secant lines meet inside a circle.
Worksheet
Curated OER

Word Problems

For Students 9th - 10th
In this geometry learning exercise, learners read a scenario and translate it using geometric concepts to find their answers. There are 15 questions with an answer key.
Lesson Plan
Curated OER

Plain Figures and Measuring Figures

For Teachers 10th - 12th
Students investigate basic geometric concepts. In this geometry lesson, students explore solids through measuring and modeling. This assignment models the importance of understanding concrete objects in geometry.      
Lesson Plan
Curated OER

Math: Tangents

For Teachers 9th - 10th
Students discover how to recognize tangents and how to use their properties. They investigate and use the properties of angles, arcs, chords, tangents, and secants. Students use two tangents and the properties of similar triangles to...
Worksheet
Curated OER

Inverse and Converse

For Students 9th - 11th
In this geometry worksheet, students identify given statements for the inverse, converse and contra-positive of a conditional statement. There are 9 questions with an answer key.
Unit Plan
Mathematics Vision Project

Module 6: Congruence, Construction, and Proof

For Teachers 8th - 10th Standards
Trace the links between a variety of math concepts in this far-reaching unit. Ideas that seem very different on the outset (like the distance formula and rigid transformations) come together in very natural and logical ways. This...
Lesson Plan
Curated OER

Connecting Area Formulas Produces a Beautiful Formula

For Teachers 11th - Higher Ed
For this math worksheet, students find the area of the triangle using the formula of 1/2 bh. Then they find the area using an alternative method.
Lesson Plan
Curated OER

Plain Figures And Measuring Figures

For Teachers 7th
Seventh graders investigate the mathematical concept of a sector. They apply the concept to an example problem and then move into a more complex application. They find the area of the side of a cone. This is done as students calculate...
Unit Plan
Khan Academy

Khan Academy: Challenge Problems: Inscribed Angles

For Students 9th - 10th Standards
Solve two challenging problems that apply the inscribed angle theorem to find an arc measure or an arc length.
Unit Plan
Khan Academy

Khan Academy: Inscribed Angle Theorem Proof

For Students 9th - 10th Standards
Proving that an inscribed angle is half of a central angle that subtends the same arc.
Activity
Analyze Math

Analyze Math: Central and Inscribed Angles

For Students 9th - 10th Standards
The interactive tutorial examines the properties of central and inscribed angles intercepting a common arc in a circle. Learners use the applet to find central and inscribed angles.
Activity
Texas Instruments

Texas Instruments: Cabri Jr. Inscribed Angles

For Teachers 9th - 10th Standards
This activity uses Cabri Jr to discover that inscribed angles subtended by the same arc in a circle are congruent.