Triangle Teacher Resources

Find Triangle lesson plans and worksheets
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Finding Perimeter Using the Pythagorean Theorem

For Students 9th - 12th Standards
What would right triangles be without the Pythagorean Theorem? Here learners see how to apply the Pythagorean Theorem to finding missing sides of triangles. The examples include both right and non-right triangles. 
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Prove the AA Similarity Theorem

For Students 9th - 12th Standards
Transform a diagram into a proof. Given two triangles on a coordinate plane, pupils develop a proof to show they are similar. The learners use the fact that two angles of one triangle are congruent to two angles of another and their...
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Construction Junction

For Students 9th - 12th Standards
A prescription for inscribing polygons makes for an interesting lesson. Individuals follow a set of written instructions to construct both an equilateral triangle and regular hexagon inscribed in a circle. An extra handout allow learners...
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Deriving and Applying the Law of Sines

For Teachers 9th - 12th Standards
Breaking the law isn't possible when talking about the Law of Sines. Individuals learn to apply the Law of Sines to solve problems involving triangles. They also learn to derive the Law of Sines.
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Module 2: Congruence, Construction and Proof

For Teachers 9th - 12th Standards
Construct yourself a winning geometry unit. A set of lessons introduces geometry scholars to constructions and proofs with compasses and straightedges. It also covers triangle congruence through transformations. This is the second of...
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Areas and Volumes - 2D Shapes

For Teachers 3rd - 6th Standards
Unfortunately for young mathematicians, the world isn't made entirely of parallelograms, triangles, and trapezoids. After first learning the area formulas for these common shapes, students apply this new knowledge to determine the area...
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A Five Day Approach to Using Technology and Manipulatives to Explore Area and Perimeter

For Teachers 3rd - 6th Standards
Young mathematicians build an understanding of area and perimeter with their own two hands in a series of interactive geometry lessons. Through the use of different math manipulatives, children investigate the properties of rectangles,...
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Extensions, Bisections and Dissections in a Rectangle

For Teachers 9th - 11th Standards
Gaining practice in translating a verbal description into a diagram and then an equation is the real point of this similar triangles exercise. Once the diagram is drawn, multiple methods are provided to reach the conclusion. An effective...
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Walking Polygons

For Teachers 4th - 6th Standards
Get up and move! With this kinesthetic activity, young mathematicians walk the sides and interior angles of given polygons. With pivoting and rotating, learners become familiar with the sum of the interior angles of a triangle.
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Let's Go On Vacation!

For Students 9th - 12th Standards
You can cover some ground traveling from point A to point B to point C. Learners apply trigonometry to give values to the ground you cover. They choose three locations and create a map. Using the Law of Sines, Law of Cosines, and Heron's...
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Rhombuses

For Teachers 9th - 12th Standards
Just what does it take to show two rhombuses are similar? The assessment task asks pupils to develop an argument to show that given quadrilaterals are rhombuses. Class members also use their knowledge of similar triangles to show two...
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EngageNY

Mid-Module Assessment Task: Grade 7 Mathematics Module 6

For Students 7th Standards
A mid-module assessment is the 16th lesson in a series of 29 geometry lessons. Individuals display their understanding of concepts such as vertical and adjacent angles, constructing geometric figures, and triangle congruence criteria.
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EngageNY

Composite Area Problems

For Teachers 7th Standards
The 21st segment in a 28-part series provides learners with area problems involving composite figures. Pupils must decide whether to add or subtract areas to find the solution. The composite figures are composed of quadrilaterals,...
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Congruence Implies Congruent Corresponding Parts

For Students 9th - 12th Standards
CPCTC (corresponding parts of congruent triangles are congruent) is COOL. Scholars look at a pair of congruent triangles. They use given measurements in the first triangle to find angle measures and sides of the second triangle.  
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Justifying SSS Congruence

For Students 9th - 12th Standards
Are congruent corresponding sides of two triangles enough to show congruence? The short assessment provides two triangles with the information that the three sets of corresponding sides are congruent. Pupils develop a proof showing that...
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Introduction to the Pythagorean Theorem

For Students 7th - 10th Standards
Use a new medium to investigate an old mathematical theorem. Young mathematicians learn about the Pythagorean Theorem from a YouTube video in the Socratica Geometry playlist. They first see if a set of values is a Pythagorean triple and...