Balanced Assessment
Mirror, Mirror II
Apply the concept of similar triangles to design a space in a room. Scholars use similar triangles to determine how a spotlight reflects from a mirror. After drawing the path of the spotlight, individuals find the smallest possible width...
Curated OER
Triangle Island
Learners calculate the altitude of triangles. In the web based lesson, students explore the interior distance from a given point in a polygon to its side. They compute the sum of these lengths. Learners read life application problems...
National Council of Teachers of Mathematics
How Many Triangles?
For this triangles worksheet, learners problem solve and shade triangles within other triangles. Students complete two problems.
EngageNY
The Converse of the Pythagorean Theorem
Is it a right triangle or not? Introduce scholars to the converse of the Pythagorean Theorem with a lesson that also provides a proof by contradiction of the converse. Pupils use the converse to determine whether triangles with given...
Curated OER
Isosceles Triangle Investigation
Students solve problems with isosceles triangles. For this geometry lesson, students identify and use the properties of triangles to solve their problems. They find the median, altitude, and angles to the triangles.
Curated OER
Triangle Classification
High schoolers classify different types of triangles. In this geometry lesson, students identify and use properties of triangles. They differentiate between isosceles and equilateral triangles.
Curated OER
Building With Triangles
Students participate in a unit on triangles. Through the unit they explore different way to make basic shapes using triangles. They also examine the basic properties of triangles and the relationships among basic geometrical shapes in...
Curated OER
Median
Students solve problems involving triangles. In this geometry lesson plan, students use the properties of triangles to find the angles and side. They identify the median and altitude of the triangle.
Curated OER
Hospital Locator
Pupils apply properties of triangles to the real world. In this geometry lesson, students identify the median and angle bisectors of triangles. They plan the appropriate are to place a new medical center based on their knowledge of...
National Council of Teachers of Mathematics
Counting the Slope: Rise Over Run
This worksheet works math masters though the concept of rise over run. They shade in the slope triangle that is created to help visualize the components. After a page of teaching the concept is a thoughtful exercise to give to your class...
Exploratorium
Afterimage
To illuminate how afterimage occurs, create a star, square, or other geometric-shaped light for learners to look at for 30 seconds. Then, have them explain what they see as they shift their focus to a blank wall. A full explanation of...
Curated OER
IGD: Perpendicular Bisector
Students draw perpendicular bisectors. In this perpendicular bisectors lesson, students identify the perpendicular bisector in a polygon. They use web tools to create and measure perpendicular bisectors. Students identify lines of...
Fayetteville Public Schools
I've Seen That Shape Before
The objectives in the resource allow students to explore the characteristics of simple solid shapes. Youngsters learn to recognize the face shapes, corners, and edges that make up 3-D figures by filling in a chart. Lastly, learners look...
Curated OER
Soccer Problem
Students solve problems with triangles. For this geometry lesson, students use the properties of triangles to solve problems. They identify the median, altitude and side vs angle relationship.
Curated OER
Simson Line
Stuednts identify triangles for the Simson Line. In this geometry lesson, students solve triangular problems using the properties of triangles.They differentiate between the height, congruency and similarity.
Curated OER
Location, Location, Location
Students investigate the properties of triangles. For this geometry lesson, students identify the location of different polygons. They identify the different properties of triangles and polygons.
Alabama Learning Exchange
Probability with Tree Diagrams
Middle school math whizzes view a PowerPoint tutorial on tree diagrams. Using "Anthonio's Pizza Palace," an interactive activity involving the selection of pizza toppings, they use Pascal's triangle as a tree diagram. This is an engaging...
Curated OER
Half Angle
Learners calculate the solution using half angles formulas. In this calculus lesson, students identify the different properties of a triangle using trigonometric properties. They identify the mean, altitude and angles of a triangle.
Curated OER
Law of Sines
Students identify the ratios of a right triangle. In this calculus lesson, students use the law of sines to solve problems involving non-right triangles. They identify the different parts of a triangle.
Curated OER
Light Bounce
Students solve problems involving triangles. In this geometry instructional activity, students apply properties of triangles to find the missing angles and sides. They identify angles of parallel lines cut by a transversal.
Pennsylvania Department of Education
Geoboards
Students describe shapes to their classmates using specific properties and practice making triangles on geoboards. In this geoboards lesson plan, students use string on the geoboards.
Curated OER
Angle Bisectors
Students identify different angles. In this geometry lesson plan, students identify different properties of triangles. They find the altitude, median and angle bisector.
Curated OER
Soda Cans
Students identify and use properties of similar figures. In this geometry lesson, students use proportions of the sides of triangles to solve triangular relationships. They use soda can as their visuals.
National Council of Teachers of Mathematics
Scale Factor
Does doubling mean everything doubles? Learners adjust the scale factor between two rectangles. Using the calculated measurements, pupils investigate the ratios between the lengths, perimeters, and areas of the rectangles.