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### We found 96 reviewed resources

Lesson Planet

#### Accelerated Geometry Review Sheet

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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#### Similarity and Right Triangle Trigonometry

Starting with similar triangles and dilation factors, this unit quickly and thoroughly progresses into the world of right triangle features and trigonometric relationships. Presented in easy-to-attack modules with copious application...

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#### Geometric Figures

Logical thinking is at the forefront of this jam-packed lesson, with young mathematicians not only investigating geometric concepts but also how they "know what they know". Through each activity and worksheet, learners wrestle with...

Lesson Planet

#### Reflections and Equilateral Triangles II

Given the lines of symmetry in an equilateral triangle, your learners find where the pre-image vertices are mapped onto the new image. They explore the properties of equilateral triangles, the impact of reflections, and the idea that the...

Lesson Planet

#### Reflections and Equilateral Triangles

Your learners collaboratively find the lines of symmetry in an equilateral triangle using rigid transformations and symmetry. Through congruence proofs they show that they understand congruence in terms of rigid motions as they prove...

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#### Tangent Lines and the Radius of a Circle

Your Geometry learners will collaboratively prove that the tangent line of a circle is perpendicular to the radius of the circle. A deliberately sparse introduction allows for a variety of approaches to find a solution.

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#### Vertical Angles Proof Samples

This visual, manipulative-based format for teaching geometric proofs nicely scafolds learners' development of mathematical reasoning and proof skills. This sample represents a proof of the congruence of vertical angles in four formats;...

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#### Manufacturing: Gas Metal Arc Welding (GMAW) Shielding Gas Mix

Middle schoolers apply math to the real-world skill of choosing the correct shielding gas mixture for welding. Even if you do not have shielding gas cylinders on hand for demonstrating, the concepts of converting percentages into...

Lesson Planet

#### Architecture and Construction: Stair Construction

Within the context of the construction industry, algebra pros begin to calculate slope from the sizes of stair steps. This is a terrific lesson, especially for aspiring engineers. Just be aware that it might be a stretch to meet all of...

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#### Is This a Rectangle?

How do you show that something is a rectangle? This activity starts with four coordinate points and asks young geometers to explain whether they create a rectangle. Knowledge from both geometry and algebra come into play here, as well...

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#### Sailing with Congruency

Young geometers will have fun with this real-world application of a geometry theorem. Working in groups, they explore the design of sailboats and must come up with a convincing argument about how the manufacturer can save time and money....

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#### Points equidistant from two points in the plane

Young geometers apply their deductive reasoning skills and knowledge of proving triangles congruent in a task that asks them to prove if a point lies on the perpendicular bisector of a segment, then it is equidistant from the endpoints...

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#### Meet Me at the Corner

Geometers use their knowledge of vertical, alternate interior, and corresponding angles in a real-world activity. Engineers plan to install guard rails at dangerous intersections of a city and need to know the angle at which to construct...

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#### The Parallelogram Law

Use your pupils' sense of curiosity to explore the Parallelogram Law. Here is an activity that outlines a complete lesson from beginning to end, allowing pupils to follow a conjecture through to the proof stage.

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#### Health Science: Back to Basics

This lesson focuses on unit conversion, proportions, ratios, exponents, and the metric system. Discuss measurement with your math class and demonstrate how to solve several health-science word problems. Give learners a chance to visit an...

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#### Nested Similar Triangles

Nested triangles have been created so that they share a common vertex and vertex angle. Learners drag the endpoints of the side that is opposite the common angle to discover the conditions that make the nested triangles similar. When...

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#### Alternate Interior Angles

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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#### Creating Parallel Lines and Transversals

Have your class create parallel lines. High schoolers will learn how to identify the different angles created by a parallel line cut by a transversal. Then, they identify and name similar and different angles.

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#### Vertical Angle Proofs

Using inductive and deductive reasoning, geometers prove vertical angles are congruent. They use patty paper to construct and measure vertical angles. Then they prove corresponding angles are congruent and consider other conjectures.

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#### Betweenness and the Sum of Parts

High schoolers differentiate lines and angles using betweenness in this geometry lesson. They differentiate angles and lines using Cabri Jr. and analyze the data and make conjecture.

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#### Proving Angles Congruent and Developing Proofs

Students explore the concept of angles. In this angles lesson, students determine the relationships of vertical, complementary, supplementary, and adjacent angles. Students construct proofs using their Ti-Nspire about vertical angles...

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#### Shortest Distance Between Points and Lines

Learners use technology to determine the shortest between two points in a plane. They are required to support their analytic explanations with visual illustrations.

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#### Angles and Transversals

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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#### Angles Formed By Parallel Lines

Young scholars explore the concept of angles formed by parallel lines.They graph two parallel lines cut by a transversal, then measure the angles formed by the transversal and record the data in a table. Learners make conjectures about...