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Lesson Plan
Curated OER

Constructing Quadrilaterals

For Teachers 9th - 12th Standards
High schoolers investigate quadrilateral construction in this geometry lesson plan. They use Cabri Jr. to construct the different quadrilaterals from the quadrilateral hierarchy given minimal definitions. The lesson plan reinforces the...
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Lesson Plan
Texas Instruments

Investigating Segments in a Quadrilateral

For Teachers 9th - 12th Standards
Investigate the properties of the shape formed by connecting the midpoints of adjacent sides of a quadrilateral. In this properties of the shape formed by connecting the midpoints of adjacent sides of a quadrilateral lesson, young...
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Lesson Plan
Curated OER

Measuring Angles in a Quadrilateral

For Teachers 9th - 12th Standards
High schoolers explore quadrilaterals in this geometry lesson. They will draw a quadrilateral, measure the angles, and find the sum of the measures of the interior angles using Cabri Jr. The interactive capabilities of Cabri Jr. allow...
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Lesson Plan
Curated OER

Investigating Lengths of Segments in a Triangle

For Teachers 9th - 12th Standards
Pupils explore the midsegment of a triangle in the geometry instructional activity. They draw and measure the segment joining the midpoints of the two sides of a triangle and compare its length to the length of the third side of the...
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Lesson Plan
Curated OER

100 Patch Geometric Quilts

For Teachers 2nd - 4th
Students identify geometric patterns in quilts. In this geometry lesson, students view various types of quilts and identify the geometric shapes. Students construct one hundred patch paper quilts using geometric shapes.
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Lesson Plan
Curated OER

Interior/Exterior Polygon Angles and Tessellations

For Teachers 9th - 11th
Students discover the sum of the interior and exterior angles of several polygons. In this Geometers sketchpad lesson, students work in groups to find the stated measurements of triangles, quadrilaterals, pentagons and hexagons. Students...
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Lesson Plan
Curated OER

Water Treatment Plant Tour

For Teachers 9th - 11th
Students define vocabulary related to geometry and calculate the volume. In this geometry lesson, students calculate flow rates, and volume as it relates to a water plant facility. They calculate the volume of three dimensional shapes...
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Lesson Plan
Curated OER

Points, Lines, and Distance

For Teachers 9th - 12th Standards
Students calculate the distance between two points. In this geometry lesson, students define the meaning of the distance between parallel lines. They find the point of intersection of other lines.
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Lesson Plan
Curated OER

Triangle Sum Theorem

For Teachers 9th - 12th Standards
Teach your class how to solve problems using the triangle sum theorem. In this geometry lesson, students identify the missing angles in a triangle using the sum theorem. They graph triangles on the TI and moves the sides around to create...
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Lesson Plan
Curated OER

Special Segments in Triangles

For Teachers 9th - 12th Standards
Students identify important properties of triangles. For this geometry lesson, students differentiate between medians, bisectors and altitudes in a triangle. They identify the properties of these important segments.
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Lesson Plan
Curated OER

Angles and Similarity

For Teachers 9th - 12th Standards
Students identify triangles as similar or congruent. In this geometry lesson, students drag triangles around on the navigator to see the effect of different angles on the shape of the triangle. They discuss angle similarity and angle...
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Lesson Plan
Curated OER

Area Measures and Right Triangles

For Teachers 9th - 12th Standards
Your class will investigate the relationship among different triangles. This geometry instructional activity, demonstrates how to make a connection between triangles and the Pythagorean Theorem. They identify the missing side or angle of...
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Lesson Plan
Curated OER

Interior Angles of Regular Polygons

For Teachers 9th - 12th Standards
High schoolers investigate the interior angles of a triangle. In this geometry lesson, students create the formula to calculate the angles inside a triangle. They observe the total sum of a triangles angle on the navigator.
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Lesson Plan
Curated OER

Creating a Midpoint Quad

For Teachers 9th - 12th Standards
Using a TI Navigator to drag quadrilaterals around to create different shapes, students learn how to draw midpoints in their quadrilaterals. In this geometry lesson, students solve problems using the properties of quadrilaterals. 
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Lesson Plan
Curated OER

Chords of a Circle

For Teachers 9th - 12th Standards
Teach how to differentiate between chords and perpendicular bisectors. In this geometry lesson, students relate the properties of chords and circle to solving right triangle. They define what makes two chords congruent in side a circle.
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Lesson Plan
Curated OER

Side Length, Perimeter, and Area of a Rectangle

For Teachers 9th - 12th Standards
Young scholars calculate area, perimeter and length of rectangles. In this geometry lesson, students create different formulas for the problem they are being asked to solve. They use the navigator to move the shape around and make...
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Lesson Plan
Curated OER

Angles of a Triangle

For Teachers 9th - 12th Standards
Learners explore the measures of the angles of a triangle in this geometry instructional activity. They use Cabri Jr. to investigate the sum of the measures of the interior angles of a triangle, and examine the relationships between the...
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Lesson Plan
Curated OER

Scale Factor Area Perimeter

For Teachers 9th - 12th Standards
Mathematicians compare triangles at different scales. In this geometry lesson, learners calculate the area and perimeter of triangles. They use the Ti to make observation of the change that takes place as the triangles are dilated.
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Lesson Plan
Curated OER

Trigonometry Ratios

For Teachers 9th - 12th Standards
Students identify the different angles and sides of a triangle. In this geometry lesson plan, students identify the six trigonometric ratios. They graph the graph of each trig function and analyze it.
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Lesson Plan
Curated OER

Congruent Triangles

For Teachers 9th - 12th Standards
Students identify properties of triangles. In this geometry lesson plan, students differentiate between similar and congruent triangles. They use the umber of sides to help define the angle of the polygon.
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Lesson Plan
Curated OER

Ratios of Similar Figures

For Teachers 9th - 12th Standards
Students identify the ratios of different triangles. In this geometry lesson, students identify the similarity and differences of triangles. They use the navigator to move the sides of the triangle around.
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Lesson Plan
Curated OER

Rhombi, Kites, and Trapezoids

For Teachers 9th - 12th Standards
Young scholars identify the number of diagonals for each polygon. In this geometry lesson plan, students identify the polygons based on their diagonals and the way it intersect. They create visuals using the navigator to see the changes...
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Lesson Plan
Curated OER

Powerful Polygons

For Teachers 2nd - 4th
Students scan the classroom to find different common shapes. They listen as the teacher defines polygon and regular polygon. The teacher demonstrates regular polygons via the Internet and the "Math is Fun" web site. Students go outside...
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Lesson Plan
Texas Instruments

Copying an Angle

For Teachers 9th - 12th Standards
High schoolers will investigate geometric construction in this geometry lesson. Your pupils can explore the basic construction of copying an angle, using the constructions tools of Cabri Jr.

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