Lesson Plan
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Twenty-Five Measures of the Angles of a Triangle Problems

For Teachers 9th - 10th
In this triangle worksheet, pupils calculate the measures of the angles or the sums of the measures of the angles in twenty-five triangle problems and hands-on activities.  The solutions are provided.
Lesson Plan
Curated OER

Triangle Classification

For Teachers 9th - 12th
Students classify different types of triangles. In this geometry instructional activity, students identify and use properties of triangles. They differentiate between isosceles and equilateral triangles.
Lesson Plan
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Constructing Midsegments of Triangles

For Teachers 9th - 10th
Pupils construct midsegments. In this geometry instructional activity, students make conjectures and apply properties of triangles to solve problems. They complete an activity on the computer.
Worksheet
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Exploring Congruent Triangles

For Students 10th
In this congruent triangles worksheet, 10th graders solve 10 different problems related to exploring various types of congruent triangles. First, they label the corresponding parts and use the figures to complete each statement. Then,...
Lesson Plan
Curated OER

Understanding the Epidemiologic Triangle through Infectious Disease

For Teachers 7th - 10th
Students examine the epidemiologic triangle. In this disease instructional activity, students discuss infectious disease as they study how they spread and discover their families' experiences with them. Students research Internet sites...
Worksheet
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Identify Types of Triangles

For Students 4th - 6th
In this triangle worksheet, students identify triangles as either equilateral, scalene or isosceles. A reference web site is given for additional activities.
Worksheet
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Identifying Triangles

For Students 4th - 6th
In this triangle worksheet, students label triangles as acute, right, obtuse, scalene, equilateral or isosceles. A reference web site is given for additional activities.
Lesson Plan
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Geometric Shapes

For Teachers 5th - 7th
Students identify polygons.  In this geometric shape instructional activity, students explore the characteristics of polygons.  They identify polygons, and classify triangles according to their sides and angles.  Students...
Lesson Plan
Curated OER

Shape Up

For Teachers 6th - 8th
Students explore differents types of triangles and quadriaterals. In this polygon lesson plan, students  model identify and compare two and three dimensional geometric figures. Students create tangrams and discover the difference...
Lesson Plan
Curated OER

Optical Illusion

For Teachers 8th - 10th
Students practice creating optical illusions as well as discerning how perception of information may change its characteristics. They distinguish between an equilateral triangle, endpoints, vertices's, and segments of triangles. The...
Worksheet
Curated OER

Pythagorean Theorem

For Students 10th
In this Pythagorean Theorem activity, 10th graders solve and complete 19 various types of problems. First, they draw the square shown and divide its sections as shown. Then, students cut out the 6 parts of the square and rearrange the 4...
Lesson Plan
Curated OER

Using Cabri Geometry to Create Fractals

For Teachers 9th - 12th Standards
Learners construct the Sierpinski Triangle using Cabri Jr. They use a step-by-step guide to construct the Sierpinski Triangle on their graphing calculator and then discuss the formula for constructing a nth stage Sierpinski Triangle.
Worksheet
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Geometry Course Review

For Students 10th
For this geometry review set of worksheet, 10th graders solve and complete 139 various types of problems. First, they find the slope-intercept form of a line passing through a point and parallel to a line given. Then, students find the...
Lesson Plan
Texas Instruments

What's the Trig?

For Teachers 9th - 12th Standards
Learners determine the trigonometric relationships within a triangle as they construct a right triangle on the Ti-89. They find the sine, cosine, and tangent of various angles of their triangle construction.
Worksheet
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Area

For Students 7th - 8th
In this area worksheet, students solve and complete 20 different problems that include the measurement of various figures. First, they determine the area of each of the triangles, parallelograms and trapezoids. Then, students determine...
Worksheet
Curated OER

Area and Perimeter

For Students 10th
In this area and perimeter worksheet, 10th graders solve and complete 18 various types of geometry problems. First, they find the area of a figure shown with consecutive sides perpendicular. Then, students find the area and perimeter of...
Lesson Plan
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I. M. Pei and the Geometry of the NGA

For Teachers 5th - 8th
Students compare design elements in neoclassical and modern architecture. They review knowledge of triangles and quadrilaterals and design a geometric pattern using Pei's polygons They create a city plan using a variety of lines and...
Lesson Plan
Curated OER

What is Fire?

For Teachers 1st - 2nd
Students conduct an experiment.  In this fire lesson, students view an experiment where they learn the conditions needed to keep a fire burning.  Students discuss the experiment and learn about the fire triangle.
Worksheet
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Review of Trig Ratios

For Students 11th - Higher Ed
In this trigonometric ratios worksheet, students solve and complete 10 various types of problems. First, they write the degrees listed in radian measure. Then, students find the exact ratios for each equation. They also find the value of...
Lesson Plan
Curated OER

Pythagorean Theorem Spreadsheet

For Teachers 6th - 8th
Studetns use a spreadsheet to organize data on the sides of a triangle. They use the Pythagorean Theorem and the If then spreadsheet function to decide whether the three sides determine a right triangle. Young scholars work individual...
Worksheet
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Area of Quadrilaterals

For Students 10th
For this area of quadrilaterals worksheet, 10th graders solve and complete 5 various types of problems. First, they solve each of the triangles shown and find the area of each triangle. Then, students prove that the sum of the squares of...
Lesson Plan
Curated OER

Shapes and Introduction to Geometry

For Teachers 2nd - 4th
Students make a quilt. In this geometry instructional activity, students discuss patchwork quilts and learn some different geometric shapes and patterns that are commonly used. Students explore designs with triangles and squares and then...
Worksheet
Curated OER

Geometric Figures

For Students 10th
In this geometric figures worksheet, 10th graders solve and complete 18 different types of problems that include various figures. First, they find the area of the figures shown if consecutive sides are perpendicular. Then, students find...
Worksheet
Curated OER

Vectors

For Students 10th
In this vectors worksheet, 10th graders solve and complete 7 various types of problems related to vectors. First, they find the third side and the angle labeled in each right triangle. Then, students resolve each of the vectors into its...

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