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96 reviewed resources

1:45
Lesson Planet

Alternate Exterior Angles: Lesson

For Students 9th - 12th Standards
Use an alternate approach to parallel lines. A resource in a comprehensive playlist on basic geometry develops the concept of alternate exterior angles and parallel lines. The presentation demonstrates how to identify alternate exterior...
1:57
Lesson Planet

Alternate Interior Angles: Lesson

For Students 9th - 12th Standards
Concepts of alternate interior angles parallel the concepts of corresponding angles. Using a diagram, the presentation defines and identifies alternate interior angles formed by a transversal and two parallel lines. The video in a...
2:27
Lesson Planet

Corresponding Angles: Lesson

For Students 9th - 12th Standards
Take a parallel view of correspondence. The resource, part of a playlist on basic geometry, introduces the corresponding angle postulate. By first identifying corresponding angles, the video highlights the relationship between the angle...
2:22
Lesson Planet

Perpendicular Lines: Lesson

For Students 9th - 11th Standards
Perpendicular lines are all right. Using the definition of perpendicular, the video lesson introduces perpendicular lines.The portion a basic geometry playlist makes connections between the rules of parallel lines and perpendicular lines.
5:43
Lesson Planet

Parallel and Skew Lines: Lesson

For Students 7th - 11th Standards
Is it possible for a pair to be parallel and skew? The resource provides the class opportunities to find out by examining the properties of parallel and skew lines. Part of a playlist on basic geometry, the video includes a brief...
Lesson Planet

Engineering Design Challenge: Exploring Structures in High School Geometry

For Teachers 9th - 12th Standards
Applying their knowledge of theorems about lines, angles, and triangles, groups build a toothpick and stick bridge to support their text book. The teams use the design process to plan, build, test, and refine their bridge designs. The...
Lesson Planet

Determination of the Optimal Point

For Teachers 9th - 12th Standards
Meet at the Fermat-Torricelli point. Individuals determine the optimal location of a facility given criteria. This means they must consider points of concurrency in a triangle, including the centroid, the incenter, the circumcenter, the...
1 In 1 Collection
Lesson Planet

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...
Lesson Planet

Identify Line Types: Intersecting and Parallel Lines

For Students 6th Standards
Navigate your way through a lesson on types of lines. Individuals drag line segments to illustrate paths between pairs of houses on an interactive map. They determine if these line segment pairs are intersecting or parallel.
Lesson Planet

Identify Line Types: Identify Types of Lines

For Students 6th - 12th Standards
If lines aren't parallel or perpendicular, then what are they? An interactive lets users rotate a line to change its orientation with respect to another line. It then indicates whether the lines are parallel, perpendicular, or...
Lesson Planet

Accurately Acquired Angles

For Teachers 9th - 12th Standards
From any angle, the resource on proving angle relationships is a good one to use. Scholars first engage in activities that enable them to identify types of angles when a transversal cuts two parallel lines. In groups, they prove a...
Lesson Planet

Name That Triangle

For Students 9th - 12th Standards
Given a line segment and its perpendicular bisector, pupils visualize a triangle with the endpoints and a point on the perpendicular as its vertices. Learners determine the type of triangle formed and provide a justification for the...
Lesson Planet

Proving the Vertical Angles Theorem

For Students 9th - 12th Standards
Why are vertical angles congruent? Pupils must identify a pair of congruent vertical angles from a diagrams. Of course, they must prove that they are congruent.
Lesson Planet

Proof with Parallelogram Vertices

For Teachers 8th - 10th Standards
Geometric figures are perfect to use for proofs. Scholars prove conjectures about whether given points lie on a triangle and about midpoints. They use a provided dialogue among fictional students to frame their responses.
Lesson Planet

Proving the Alternate Interior Angles Theorem

For Students 9th - 12th Standards
Proofs not included; you must write them on you own. Learners write a proof that alternate interior angles are congruent. The proof must rely on rigid motions.
Lesson Planet

Finding Angle Measures 1

For Students 9th - 12th Standards
How does your class measure up to finding angle measurements? Young scholars of geometry find the measurements of four missing angles on three concurrent lines. After finding each measurement, they must then justify their answers. Use...
Lesson Planet

Finding Angle Measures 2

For Students 9th - 12th Standards
Can your pupils determine the measurement of seven angles from the measurement of just one? Geometry enthusiasts tackle this task in a problem involving parallel lines with a transversal. After finding the correct measurements, the class...
Lesson Planet

Equidistant Points

For Students 9th - 12th Standards
What's so special about perpendicular bisectors? Pupils investigate points on the perpendicular bisector of a line segment. They write a proof for why a point on the perpendicular bisector is equidistant from the endpoints of the line...
Lesson Planet

Finding Angle Measures 3

For Students 9th - 12th Standards
Is your class up to the challenge of angle measurement? Find out using a fun formative! Geometry scholars show off their skills using a simple worksheet involving parallel lines, transversals, and missing measurements. Check up on those...
Lesson Planet

Lines and Angles

For Teachers 9th - 11th Standards
Explore angle relationships associated with transversals. Pupils construct parallel lines with a transversal and find the measures of the angles formed. They figure out how the different angles are related before constructing...
Lesson Planet

Angles: Parallel Lines

For Students 9th - 11th Standards
Viewers are presented with seven problems with parallel lines and angle relationships and must use the given information to find the measures of specific angles. To finish, they explain their process in finding the measures in the problems.
Lesson Planet

Quadrilaterals

For Teachers 9th - 12th Standards
What figure is formed by connecting the midpoints of the sides of a quadrilateral? The geometry assessment task has class members work through the process of determining the figure inscribed in a quadrilateral. Pupils use geometric...
Lesson Planet

Circles in Triangles

For Teachers 9th - 12th Standards
Challenge the class with inscribed circles in triangles. The assessment task requests class members use their knowledge of circles and right triangles to prove two triangles are congruent. They go on to utilize their knowledge of...
Lesson Planet

Parallel Lines, Transversals, and Angles: What’s the Connection?

For Students 9th - 11th Standards
Streets, bridges, and intersections, oh my! Parallel lines and transversals are a present in the world around us. Learners begin by discovering the relationship of the angles formed by parallel lines and a transversal. They then apply...