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Unit Plan
Mathematics Vision Project

Circles: A Geometric Perspective

For Teachers 10th - 12th Standards
Circles are the foundation of many geometric concepts and extensions - a point that is thoroughly driven home in this extensive unit. Fundamental properties of circles are investigated (including sector area, angle measure, and...
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Activity
101 Questions

Pool Bounce

For Teachers 9th - 12th Standards
Use geometry to improve your pool game! Learners analyze the front half of a pool shot to determine its resulting path. By measuring the angle of incidence, they are able to predict the path of the ball. 
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Interactive
CK-12 Foundation

Proofs: Angle Pairs and Segments—The Three Angle Problem

For Students 9th - 11th
Finding the sum of the measures of three angles is easy, unless you have no clue what the measures are. Learners use an interactive diagram to see a geometric problem in a different way. A set of challenge questions takes them through...
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Handout
Charleston School District

Similar Triangles

For Students 8th Standards
Are they similar? The lesson provides an explanation of the angle-angle criterion for triangle similarity. Several problems allow the class to determine whether the two triangles with the given angle measures are similar or not. 
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Interactive
CK-12 Foundation

Angle Classification: Crazy Quilt

For Students 9th - 12th Standards
There's more to a quilt than just a pretty pattern—there's geometry! Explore angle classification using an artistic approach to show your class that quilt designs are really just intricate geometric patterns. Here, scholars create a...
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Worksheet
Curated OER

Using Trinonometry to Find Angle Measures

For Students 10th - 12th
In this trigonometric ratios worksheet, students find the missing angle of 20 triangles by using sine, cosine and tangent ratios. Students compute the angle measurement of given ratios for six problems.
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Worksheet
Curated OER

Kuta Software - Angles in Quadrilaterals

For Students 9th - 12th
In this angles in quadrilaterals worksheet, high schoolers solve 18 short answer problems. Students find unknown angles in a quadrilateral given a sketch of various quadrilaterals with unknown angle measurements.
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Worksheet
Curated OER

Right Triangle Trigonometry

For Students 10th
In this geometry activity, 10th graders use right triangle trigonometry to find the missing angle measure.  The two page activity contains fourteen problems.  Answers are provided. 
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Worksheet
Curated OER

Tests for Parallelograms Homework

For Students 9th - 12th
In this test for parallelograms worksheet, high schoolers solve 15 short answer problems. Students determine if a given sketch is a parallelogram given angle measures and/or side lengths. High schoolers use knowledge of parallelograms to...
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Worksheet
Curated OER

Geometry: Properties of Triangles

For Students 10th - 12th
For this properties of triangles worksheet, students use their knowledge of triangles to find determine angle measurement. They use geometric theorems to prove equal angles. This three-page worksheet contains 15 multi-step geometry...
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Worksheet
Curated OER

Easy Worksheet: Right Triangles and Circles

For Students 9th - 12th
In this right triangles and circles worksheet, students solve 4 short answer problems. Students describe a right triangle formed by point on a circle and an angle measure.
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Lesson Plan
Curated OER

Measurement

For Teachers 9th - 11th
Students measure angles, perimeter, area and volume. In this geometry lesson, students define different ways to measure and solve for the perimeter, area and volume of geometric shapes. They analyze and process information to help them...
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Worksheet
Curated OER

Measuring Angles

For Students 10th
In this measuring angles worksheet, 10th graders solve and complete 26 various types of problems. First, they use a protractor to find the measurement of each angle. Then, students state the Angle Addition Postulate for the three angles...
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Worksheet
Curated OER

Classify and Measure Angles

For Students 3rd - 5th
In this angles learning exercise, students use a protractor to measure and classify a set of 9 angles. A reference web site is given for additional activities.
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Worksheet
Curated OER

Polygons and Angle Measurement

For Students 8th - 10th
In this polygons and angle measurement instructional activity, learners identify polygons and determine the measurement of each angle of the polygon. They identify parallelograms and justify why objects are or are not polygons. This...
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Worksheet
Curated OER

Chapter 4 - Objective 3.1 - Perimeter & Angle Measure

For Students 10th - 12th
For this perimeter and angle measure worksheet, students find the length of the side of triangles and rectangles from given information. They read story problems, write equations and solve the problem. This one-page worksheet contains...
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Worksheet
Curated OER

Angles and Measuring

For Students 10th
Learners identify various angles and how to measure each type. They use a protractor to measure each of the angles. Students also write the name of the angle and identify the number of degrees for each.
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Lesson Plan
Curated OER

Projectiles

For Teachers 3rd - 8th
Learners measure the angle and distance of an arc. In this projectile lesson, students observe arcs created by water guns, bow and arrows, and slingshots, then work in small groups and use protractors and strings to measure the angle and...
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Lesson Plan
Curated OER

Measurement: The Size is Right

For Teachers Pre-K - 8th
Specific learning goals are grouped for different grade levels spanning pre-kindergarten to eighth grade. After preparing the questions and materials, you call a learner to come in front of the class and play the game. Young learners...
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Lesson Plan
Curated OER

Polygons

For Teachers 5th - 7th
Students investigate the concepts related to the study of polygons. They specifically look at how angles is related. The lesson includes specific examples and dialogue to be used by the teacher during direct instruction and independent...
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Lesson Plan
Curated OER

Measuring Angles

For Teachers 6th
Sixth graders identify and measure right, acute, obtuse, and straight angles. In this geometry lesson plan, 6th graders review the definition of each angle and are shown examples of each specific angle. Students use toothpicks, gumdrops,...
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Lesson Plan
Curated OER

Measuring Angles in a Triangle

For Teachers 9th - 12th Standards
High schoolers investigate the sum of the measures of the angles of a triangle. They draw a triangle and measure the interior angles. Using Cabri Jr., learners find the sum of the measures of the interior angles. The instructional...
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Lesson Plan
Curated OER

Cabri Jr. Inscribed Angles

For Teachers 9th - 12th Standards
Young scholars construct inscribed angles using Cabri Jr. They draw a circle on their graphing calculator, then construct an inscribed angle and measure its angle measures. Learners drag the inscribed angle around the circle. They make...
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Lesson Plan
Alabama Learning Exchange

Radians: Just Another Way

For Teachers 9th - 12th Standards
Serve up angle measurements on paper plates. Pupils use paper plates and paper-folding techniques to create a unit circle with conversions for special angles. Using their plates, learners explore the relationship between angle...

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