Similar Triangles Teacher Resources

Find Similar Triangles lesson plans and worksheets
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EngageNY Grade 8 Math Module 3: Similarity

For Teachers 8th Standards
The concept of similarity is the focus of a module designed to boost eighth grader's math skills. Scholars examine the Fundamental Theorem of Similarity, dilations, and the Pythagorean Theorem. The module consists of 14 lessons and two...
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Similar Triangles and Linear Functions

For Teachers 8th Standards
What do similar triangles have to do with linear equations? Building on prior knowledge of similar triangles, learners discover that the slope of the sides of similar triangles is the same. They make their discoveries while graphing...
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Investigating Similar Triangles

For Teachers 9th - 12th
Let your use of the resource be in proportion to its usefulness. Pupils investigate similar triangles by measuring side lengths and considering given angle measures. The results of the investigation help develop generalizations about...
3:34
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Inscribed Similar Triangles: Lesson

For Students 6th - 12th Standards
Create similar triangles with a little altitude. A section of an extensive playlist on basic geometry discusses how an altitude of a right triangle creates similar triangles. Using the theorem, the presentation finds unknown side...
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Unit 5: Worksheet 3 - Similar Triangles

For Students 8th - 9th
In this similar triangles worksheet, students use proportions to solve for the missing sides of similar triangles. This two-page worksheet contains 16 multi-step problems.
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Similar Triangles 1

For Students 9th - 12th Standards
Find two similar triangles in plane sight. Given a figure composed of a parallelogram and a triangle, pupils identify two similar triangles and provide an explanation. Class members use the similar triangles to find two missing side...
9:34
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Similar Triangles

For Students 9th - 10th
Although a rather complicated topic, this video manages to clearly explain the concept of solving problems involving similar triangles. It employs problem solving to determine whether two figures are similar triangles. In addition, it...
9:55
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Similar Triangles (Part 2)

For Students 9th - 10th
Building on concepts in the first part of the series on similar triangles, installment number two explores how to find the values for given angles in a triangle. These problems are solved by using algebra and ratios. A step-by-step...
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Identifying Similar Triangles

For Teachers 7th - 9th Standards
Math whizzes work with angle sums and exterior angles to figure out the measure of other angles. This particular publication provides comprehensive support in the form of an anticipatory activity, questions designed to prompt discussion,...
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Similar Triangles and Proportions

For Teachers 9th - 12th Standards
Pupils investigate similar triangles and proportions as they make conjectures about the length of sides of similar triangles. For this lesson, have your class construct similar triangles using Cabri Jr so that they share a common vertex.
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Angular Size and Similar Triangles

For Students 8th - 10th
In this angular size and similar triangles worksheet, students use the properties of similar triangles and the ratios of sides to solve for unknowns in given diagrams.
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Measurement of Objects Using Similar Triangles in The Plane

For Teachers 9th - 11th
Students use similar triangles and a sight tool to find the height and distance between large objects. In this similar triangles lesson plan, students use a constructed sight tool to measure the distance and height of an object using an...
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A Geometry Worksheet - Similar Triangles

For Students 9th - 12th Standards
In this similar triangles instructional activity, students find the scale factor of 6 sets of similar triangles. Students find the scale factor of two similar triangles given a sketch with measurements. Students use proportions to find a...
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Similar Triangles

For Students 8th - 10th Standards
Model geometric concepts through a hands-on approach. Learners apply similar triangle relationships to solve for an unknown side length. Before they find the solution, they describe the transformation to help identify corresponding sides.
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Similar Triangles 2

For Students 9th - 12th Standards
Pupils use a parallelogram containing intersecting line segments to identify two similar triangles. They justify the similarity and use it to find a missing length.
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Chapter 8 Extra Problems Worksheet: Similar Triangles

For Students 9th - 12th
For this similar triangles worksheet, high schoolers solve 6 similar triangles. Students use proportions to solve similar triangles and similar rectangles.
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Kuta Software - Infinite Geometry: Similar Triangles

For Students 9th - 12th
In this similar triangles worksheet, students solve 20 short answer problems. Students determine if two given triangles are similar.  Students determine the type of similarity given two triangles. Students are given a sketch of the...
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Glencoe - Proportions and Similar Triangles

For Students 9th - 12th
In this proportions and similar triangles learning exercise, students solve 14 multiple choice problems. Students find unknown sides of similar triangles using proportions. Students multiply means and extremes to solve proportions.
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Similar Triangles and Trapezoids, and Circles

For Students 9th - 12th
High schoolers answer two problems involving area of shaded regions. Students then answers six questions involving perimeter, area, and circumferences. The remaining two questions involve ratios of similar figures.
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Identifying Similar Triangles

For Students 10th
In this identifying similar triangles worksheet, 10th graders solve 6 different types of problem that include identifying and comparing similar triangles. First, they identify the three ways that determine whether two triangles are...
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The Height of Trees and Mountains (Similar Triangles)

For Teachers 9th - 10th
Students solve problems using triangular theorem. In this geometry lesson, students identify similar triangles and prove why they are similar. They differentiate between similar and congruent triangles based on the ratios of the sides of...
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Identifying Similar Triangles

For Students 10th
In this identifying similar triangles worksheet, 10th graders solve 5 different proofs related to similar triangles. First, they identify the similar triangles in each figure and explain why they are similar, using the information to...
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Parts of Similar Triangles

For Students 10th
For this parts of similar triangles worksheet, 10th graders solve 6 different problems related to determining the value of various parts of similar triangles. First, they find the value of x in the 2 figures shown. Then, students find...
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EngageNY

More About Similar Triangles

For Teachers 8th Standards
Determine whether two triangles are similar. The lesson presents opportunities for pupils to find the criterion needed to show that two triangles are similar. Scholars use the definition of similarity to find any missing side...

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Similar Triangles