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Lake Afton Public Observatory

Shadows, Angles, and the Seasons

For Teachers 3rd - 7th Standards
Shine some light on the topic of seasonal change with this collection of activities. Whether it's by measuring the change in the length of their shadows, or modeling the earth's orbit around the sun using a lamp and a globe, these simple...
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Worksheet
Curated OER

Challenge: Skills and Applications Lesson 3.3

For Students 9th - 12th
For this angle measures worksheet, learners solve 9 short answer problems. Students find values for x and y given two parallel lines cut by a transversal. Learners use alternate interior, supplementary, and exterior angles to find x and y.
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Worksheet
Curated OER

Review of Geometry I

For Students 7th - 10th
In this review worksheet, students identify the characteristics of intersecting and parallel lines  They explore vertical, supplementary, alternate interior, alternate exterior  and corresponding angles.  This two-page worksheet contains...
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Worksheet
Curated OER

Proving Lines Parallel

For Students 10th
In this proving lines parallel instructional activity, 10th graders solve 10 different types of problems that prove that various lines are parallel to each other. First, they find the value of x so that line a is parallel to line b....
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Worksheet
Curated OER

Triangle Similarity

For Students 10th
In this triangle similarity learning exercise, 10th graders solve and complete 12 different problems that include defining similar and 3 similar statements using only sides and angles. First, they determine if each pair of triangles...
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Worksheet
Curated OER

Angles in Polygons

For Students 10th
In this geometry instructional activity, 10th graders solve problems involving quadrilaterals using the angle sum of quadrilaterals. They solve for linear pairs, opposite angle theorem and triangular angles. There are 5 questions.
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Worksheet
Curated OER

Chapter 5 Final Review Extra Problems. Triangles

For Students 10th - 12th
In this triangles worksheet, students identify the median, altitude, segment, angle bisector, perpendicular bisector and triangle midsegment of triangles.  They find the perimeter of triangles.  This three-page worksheet contains 8...
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Worksheet
Curated OER

Reviewing Azimuth

For Students 8th - 10th
Combine angles and the compass rose in this labelling worksheet. Geographers begin by labeling the cardinal directions on a compass template, along with the degrees corresponding to each. They then add the azimuthal directions, labeling...
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Worksheet
Curated OER

Right Triangles

For Students 10th
In this right triangles worksheet, 10th graders solve 6 various problems and figures related to right triangles. First they identify and describe the 3 theorems and 1 postulate stated that prove 2 right triangles congruent if one of them...
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Assessment
Inside Mathematics

Hopewell Geometry

For Teachers 9th - 12th Standards
The Hopewell people of the central Ohio Valley used right triangles in the construction of earthworks. Pupils use the Pythagorean Theorem to determine missing dimensions of right triangles used by the Hopewell people. The assessment task...
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Lesson Plan
Virginia Department of Education

How Many Triangles?

For Teachers 9th - 11th Standards
Something for young mathematicians to remember: the sum of any two sides must be greater than the third. Class members investigates the Triangle Inequality Theorem to find the relationship between the sides of a triangle. At the same...
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Lesson Plan
EngageNY

An Area Formula for Triangles

For Teachers 11th - 12th Standards
Use a triangle area formula that works when the height is unknown. The eighth installment in a 16-part series on trigonometry revisits the trigonometric triangle area formula that previously was shown to work with the acute triangles....
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Worksheet
Helping with Math

Angles: Supplementary, Corresponding & Alternate (2 of 2)

For Students 6th - 8th Standards
In the second of two similar worksheets, anglers compute missing angles when given an alternate, supplementary, or complementary value. There are six problems to solve, but each of them requires two to four solutions. This is a nice...
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Worksheet
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Helping with Math

Angles: Supplementary, Corresponding & Alternate (1 of 2)

For Students 6th - 8th Standards
In the first of two similar worksheets, geometers compute two to four unknown angles when given an alternate, supplementary, or complementary value. There are six multliple-step problems to solve. This is a nice challenge for your...
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Worksheet
Curated OER

Angles

For Students 6th - 7th
In this math worksheet, students find the measurements of angles created by intersecting lines. Students are first presented with two intersecting lines, then a pair of parallel lines with one intersecting line. The second page has an...
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Assessment
Concord Consortium

Isosceles Triangle Spaces

For Students 7th - 10th Standards
How many different types of triangles can your class name? A discovery lesson guides learners through an exploration of the different triangle types and the relationships between their angles and sides. Using coordinate geometry,...
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Worksheet
Curated OER

Exploring Similar Figures

For Students 10th
In this similar figures instructional activity, 10th graders solve and measure 10 different angles that are similar. First, they determine which angel corresponds to each given angle. Then, students determine the scale factor of a...
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Worksheet
Curated OER

Skills and Application

For Students 9th - 10th
In this geometry learning exercise, students identify the different properties of parallel lines cut by a transversal. They identify the different angles created by such lines. There are 16 questions.
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Worksheet
Curated OER

Parallel Lines and Transversals

For Students 10th
In this parallel lines and transversals instructional activity, 10th graders solve nine different problems related to measuring parallel lines and transversals. First, they name two more pairs of parallel segments, two more skew...
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Assessment
Charleston School District

Review Unit 2: Congruence and Similarity

For Students 8th Standards
Review for the test with a comprehensive list of terms and concepts for the unit on congruence and similarity. It divides divides the sections in the order of the lessons presented during the unit. 
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Worksheet
Curated OER

More Congruent Triangles

For Students 10th
In this congruent triangles worksheet, 10th graders solve 5 various types of geometry problems related to triangles. First, they draw and label triangles, indicating the additional pairs of corresponding parts that would have to be...
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Worksheet
Curated OER

Twenty-Eight Parallel Lines with a Transversal Problems

For Students 9th - 10th
In this parallel lines with a transversal worksheet, students identify angles as corresponding, alternate interior, or alternate exterior, find the measure of angles, and solve for indicated values.  The solutions are provided.
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Worksheet
Curated OER

Angles and Parallel Lines

For Students 9th - 10th
In this geometry worksheet, students identify the different angles formed by cut parallel lines. They name the angles and find the measures of each. There are 24 questions.
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Worksheet
Curated OER

More Congruent Triangles

For Students 10th
In this congruent triangles instructional activity, 10th graders solve 6 various forms of problems that include a proof and a word problem. First, they draw and label triangles and indicate the additional pairs of corresponding parts...

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