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eBook
Math Planet

Math Planet: Geometry: Working With Logic

For Students 9th - 10th Standards
How to determine if a logical statement is true or false is explained through examples and a video lesson. [2:46]
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eBook
Math Planet

Math Planet: Geometry: Conjecture

For Students 9th - 10th Standards
Conjecture is explained through examples and a video lesson. [0:41]
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Handout
CK-12 Foundation

Ck 12: Geometry: Parallelograms Study Guide

For Students 7th - 9th Standards
This study guide on parallelograms covers types of quadrilaterals, properties of parallelograms and theorems that describe them, how to identify parallelograms, and special types of parallelograms. It is available for download with free...
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eBook
CK-12 Foundation

Ck 12: Interactive Geometry: 1.7 the Pythagorean Theorem

For Students 9th - 10th Standards
Explore and discover the Pythagorean theorem.
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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.
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Handout
Oswego City School District

Regents Exam Prep Center: Theorems and Postulates for Geometry

For Students 9th - 10th Standards
Here is a partial list of theorems, postulates, and properties.
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Unit Plan
CK-12 Foundation

Ck 12: Geometry: Pythagorean Theorem and Pythagorean Triples

For Students 9th - 10th Standards
[Free Registration/Login may be required to access all resource tools.] Apply the Pythagorean Theorem and its converse. Includes videos, exercises, links to interactive activities, etc.
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Unit Plan
CK-12 Foundation

Ck 12: Geometry: Deductive Reasoning

For Students 9th - 10th
[Free Registration/Login may be required to access all resource tools.] In this lesson students use deductive reasoning to solve problems. Students examine guided notes, review guided practice, watch instructional videos and attempt...
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Unit Plan
CK-12 Foundation

Ck 12: Geometry: Deductive Reasoning

For Students 9th - 10th
[Free Registration/Login may be required to access all resource tools.] This concept introduces students to deductive reasoning using the laws of detachment, contrapositive, and syllogism. Students examine guided notes, review guided...
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Unit Plan
CK-12 Foundation

Ck 12: Geometry: Conjectures and Counterexamples

For Students 9th - 10th
[Free Registration/Login may be required to access all resource tools.] In this lesson students make conjectures and provide counterexamples. Students examine guided notes, review guided practice, watch instructional videos and attempt...
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Unit Plan
CK-12 Foundation

Ck 12: Geometry: Inscribed Similar Triangles

For Students 9th - 10th Standards
[Free Registration/Login may be required to access all resource tools.] Apply the fact that the altitude of a right triangle creates similar triangles.
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Website
Other

Antonio Gutierrez: Geometry From the Land of the Incas

For Students 9th - 10th
Discovering the properties of constructions, seeing proofs in action, and viewing problems come to life here with this wonderful use of technology in the classroom. Single steps are explained and illustrated one at a time so that the...
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Lesson Plan
Michigan State University

Michigan State University: Biometrics: Hand Geometry

For Teachers 9th - 10th Standards
Students use hand geometry to prove their own identification.
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Activity
Texas Instruments

Texas Instruments: Preparing for Proofs

For Teachers 9th - 10th
This activity introduces students to the terms of hypothesis, conclusion, conditional, converse, inverse, contrapositive, and biconditional using popular advertising slogans. A learning check activity is used to check their understanding...
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Interactive
Mangahigh

Mangahigh: Shape: Proof of the Sum of the Angles in a Triangle

For Students 9th - 10th Standards
Determine that all angles in a triangle equal 180 degrees.
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Interactive
Mangahigh

Mangahigh: Shape: Proof of the Exterior Angle Theorem for a Triangle

For Students 9th - 10th Standards
Use your knowledge of exterior angles of a triangle to prove the theorem.
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Activity
Maths Challenge

Maths challenge.net: Right Triangle Equal Parts

For Students 9th - 10th Standards
A geometry proof problem involving a right triangle and finding angles of equal measure.
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Activity
Maths Challenge

Maths challenge.net: Inscribed Rectangle

For Students 9th - 10th Standards
This is a proof problem, considered a "three star" geometry problem requiring knowledge of proofs and properties of circles to solve this equal area of inscribed polygons problem.
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Handout
Maths Challenge

Maths challenge.net: Three Circles

For Students 9th - 10th Standards
This is a proof problem, considered a "three star" geometry problem requiring knowledge of proofs and properties of circles.
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Activity
Maths Challenge

Maths challenge.net: Isosceles Trapezium

For Students 9th - 10th Standards
This is a "three star" geometry problem where prior knowledge of problem solving and thinking through proofs is recommended to solve this trapezoid inscribed in a semicircle problem.
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Activity
Maths Challenge

Maths challenge.net: Tri Angles

For Students 9th - 10th Standards
A geometry proof involving exterior angles of a triangle.
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Activity
Maths Challenge

Maths challenge.net: Perpendicular Construction

For Students 9th - 10th Standards
This is a "three star" geometry problem where prior math problem skills and proof experience is recommended to solve this "Perpendicular Construction" problem.
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Activity
Maths Challenge

Maths challenge.net: Spider Fly Distance

For Students 9th - 10th Standards
A "three star geometry problem" requiring knowledge of how to complete geometric proofs and some prior math skills to figure the shortest distance between the opposite corners of a cuboid.
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Activity
Maths Challenge

Maths challenge.net: Alley Ladders

For Students 9th - 10th Standards
This is a "three star" geometry problem where prior math problem skills and proof experience is recommended to solve this relationship between the inverses of heights.

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