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Lesson Plan
EngageNY

Unknown Angle Proofs—Proofs with Constructions

For Teachers 9th - 10th Standards
Provide your emerging mathematicians with the tools to learn as they incorporate auxiliary lines to solve unknown angle proofs in this continuing segment. They decipher information from a diagram to uncover the missing pieces and...
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Lesson Plan
EngageNY

Similarity and the Angle Bisector Theorem

For Teachers 9th - 10th Standards
Identifying and verifying reproducible patterns in mathematics is an essential skill. Mathematicians identify the relationship of sides when an angle is bisected in a triangle. Once the pupils determine the relationship, they prove it to...
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Worksheet
Curated OER

Angles and Parallel Lines

For Students 9th - 10th
In this geometry activity, students identify the different angles formed by cut parallel lines. They name the angles and find the measures of each. There are 24 questions.
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Worksheet
Curated OER

Co-exterior Angles Worksheet

For Students 10th
In this geometry worksheet, 10th graders analyze angles created by a transversal. They identify co-exterior angles as they review theorems dealing with parallel lines. There are 6 questions with an answer key.
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Lesson Plan
EngageNY

Making Scale Drawings Using the Parallel Method

For Students 9th - 10th Standards
How many ways can you create a dilation? Many! Individuals strengthen their understanding of dilations by using various methods to create them. The new technique builds on pupils' understanding of the ratio method. Using the ratio,...
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Worksheet
Academic Magnet High School

Parallel Lines Proofs Practice

For Students 8th - 11th Standards
Here is a worksheet that lines up perfectly with the skills needed to finish a geometric proof. Eleven problems are given to see if learners can prove that lines are parallel or angles are congruent. 
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Unit Plan
Mathematics Vision Project

Module 4: Similarity and Right Triangle Trigonometry

For Teachers 9th - 12th Standards
Right you are to use a great resource. Starting with a lesson on dilations, scholars learn about similarity transformations and similar triangles. They use the knowledge to develop an understanding of right triangle trigonometry in later...
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Interactive
Curated OER

Angles and Parallel Lines Quiz

For Students 9th - 10th
In this geometry worksheet, students identify missing angles and sides. They identify angles formed by parallel lines cut by a transversal. There are 7 questions with an answer key.
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Lesson Plan
Curated OER

Angles and Transversals

For Teachers 9th - 12th Standards
Pupils explore the concept of angles and transversals. They construct parallel and non-parallel lines cut by a transversal using Cabri Jr. Learners then determine which angles are congruent and the relationship of angles when two lines...
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Lesson Plan
Curated OER

Alternate Interior Angles

For Teachers 9th - 12th Standards
Label angles of parallel lines to analyze the angles created by a transversal and two parallel lines. They graph their lines and observe the similarity and difference in the angles.
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Lesson Plan
Curated OER

Special Angles on Parallel Lines

For Teachers 10th
Tenth graders investigate parallel lines and their special angles cut by a transversal. In this geometry instructional activity, 10th graders identify and find corresponding, alternate interior, and alternate exterior angles formed when...
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Lesson Plan
Curated OER

Making Parallel Lines

For Teachers 8th - 10th
Students differentiate between parallel and perpendicular lines. In this geometry lesson plan, students make conjectures and apply it to solve real life situations. They collect data and make predictions based on the data.
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Lesson Plan
Curated OER

Proportional Segments Between Parallel Lines

For Teachers 9th - 12th
Students identify similar triangles.  In this proportional segments lesson, students identify corresponding sides, set up ratios, and find the length of the missing side of a triangle.  They use the parallel/proportionality conjecture to...
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Worksheet
Curated OER

Parallel and Perpendicular Lines

For Students 9th - 10th
In this algebra/geometry activity, students investigate the slopes and equations of parallel and perpendicular lines.  The two page activity contains a combination of eleven multiple choice and free response questions.  Solutions are...
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Worksheet
Geometry Accelerated

Accelerated Geometry Review Sheet

For Students 8th - 10th Standards
Your geometry learners use their knowledge of various geometric concepts to write proofs. Starting with givens containing parallel line segments with transversals and triangles and quadrilaterals, and the mid-point and distance formulas;...
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Worksheet
Curated OER

Parallel Lines

For Students 10th
In this geometry worksheet, 10th graders determine the measures of the angles formed when parallel lines are cut by a transversal.  The two page worksheet contains eleven problems.  Answers are not provided. 
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Lesson Plan
EngageNY

Solve for Unknown Angles—Transversals

For Teachers 9th - 10th Standards
Lead your class on an exciting journey through the world of math as they review geometry facts and solve for unknown angles. They learn how to use auxiliary lines and congruent angles to correctly complete each practice problem...
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Worksheet
Curated OER

Angles and Parallel Lines

For Students 8th - 10th
In this geometry worksheet, students identify the interior and exterior angles of parallel lines cut by a transversal. There are 11 questions with an answer key.
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Interactive
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GeoGebra

Conjectures and Proof

For Students 9th - 12th Standards
Transform proofs using triangle rotations. By rotating a triangle around various points, class members develop proofs. Participants prove relationships of alternative interior angles formed by parallel lines and the sum of the interior...
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Worksheet
Curated OER

Angles and Parallel Lines Homework

For Students 9th - 10th
For this geometry worksheet, students identify the angles formed by parallel lines and a transversal. They differentiate between the angles of a transversal and that of a perpendicular line. There are 14 questions.
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Worksheet
Curated OER

Parallel and Perpendicular Lines

For Students 7th - 11th
In this parallel and perpendicular lines worksheet, students identify angles formed by these lines.  They list and find the measurement of interior angles, exterior angles, alternate interior, alternate exterior and corresponding...
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Interactive
Curated OER

Proving Lines Parallel Multiple Choice

For Students 10th - 12th
In this geometry worksheet, students identify parallel lines, examine and interpret diagrams, and find the value of corresponding angles and lines.  This one-page worksheet contains 6 multiple-choice problems.  Answers are provided on...
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Worksheet
Curated OER

Angles, Bearings and Maps

For Students 9th - 12th
In this secondary mathematics worksheet, students determine how many independent angles are in a diagram, bearings, and flight paths. The four page worksheet contains seven problems. Answers are provided. 
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Worksheet
Curated OER

Proving Lines Parallel

For Students 10th
In this proving lines parallel worksheet, 10th graders solve 10 different types of problems that prove that various lines are parallel to each other. First, they find the value of x so that line a is parallel to line b. Then, students...

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