Illustrative Mathematics
Right Triangles Inscribed in Circles II
So many times the characteristics of triangles are presented as a vocabulary-type of lesson, but in this activity they are key to unraveling a proof. A unique attack on proving that an inscribed angle that subtends a diameter must be a...
Flipped Math
Unit Circle and Radians
Measure angles is easy as pi. Pupils review special right triangles to find exact values for trigonometric functions. Scholars learn about radians and how they connect to measurements in degrees. They find exact and approximate values of...
CK-12 Foundation
Radian Measure: Unit Circle Conversions
Individuals investigate the relationship between radian and angle measurements by using an interactive to find the angle measurement for given radian measures. Users answer questions to convert between the two measurements.
CK-12 Foundation
Reference Angles and Angles in the Unit Circle: Exploring Reference Angles
A steal of a deal — get four angles for the value of one. An interactive resource allows individuals to visualize all four angles that have the same reference angle. Pupils answer questions by using the interactive to create the...
CK-12 Foundation
Coterminal Angles: Full Circle
Take a terminal side for a spin. Pupils use an interactive to investigate angles of rotation that share the same terminal side. Scholars create coterminal angles and calculate what other angle sizes share the same final position.
Curated OER
Calculate the Area
In this area of a circle worksheet, 6th graders must calculate the area of 5 circles given either the radius or diameter. Students must write the area on the line provided and a blank space is provided for students to work out the...
Curated OER
Calculate the Circumference
In this calculate the circumference worksheet, 7th graders find the circumference given the diameter of 4 circles; the formula and the answers are provided.
Curated OER
Circle the Simile
Figurative language is a welcome addition to creative writing. Clearly describe similes with this activity. For each of 10 example sentences, learners have to identify what is being compared. An answer key is provided with this great...
Curated OER
Trig Cheat Sheet
Your pre-calculus learners will make use of this wonderful cheat sheet that summarizes all things trigonometric. Definitions based on both the unit circle and the right triangle are included, as well as many convenient trigonometric...
Curated OER
Trigonometry Review Sheet
Get the trig facts fast, and use the review sheet as a guide in the classroom. The worksheet also includes a document version if any changes are needed to the problems. The information includes a small degree/radian chart, a graph of all...
Curated OER
Circle Area, Perimeter and Circumference
In this geometry skills worksheet, students respond to 7 questions that require them to find the area, perimeter, and circumference of circles.
Curated OER
Circle Area, Perimeter and Circumference #2
In this area, perimeter and circumference instructional activity, students determine radius and circumference of given circles. A reference web site is given for additional activities.
Curated OER
Concurent Circles II
In this geometry worksheet, students draw a shape based on the directions. They tell the reasons the four resulting circles are concurrent. A sample drawing is included.
Curated OER
Circles and Squares
In this circles and squares worksheet, students try to make a circle by only using straight lines and a square. Students follow 4 sets of directions.
Curated OER
Circle Graph-Fractions
In this circle graphs worksheet, students determine what fraction of a pie graph is a designated color. Answers are included on page 2.
Curated OER
Parts of a Circle
In this circle worksheet, students choose the correct term that describes a given set of math symbols, using a labeled circle. A reference web site is given for additional activities.
Curated OER
Parts of a Circle
In this parts of a circle worksheet, students choose correct terms to identify labeled parts of a circle. A reference web site is given for additional activities.
Curated OER
Parts of a Circle
In this parts of a circle worksheet, students choose the correct term to describe labeled parts of a circle. A reference web site is given for additional activities.
Curated OER
Area of Circle Worksheet
In this area of circles activity, 5th graders find the area of a set of 4 circles, giving answers in terms of pi. Work space is provided, answers are includes.
Curated OER
Circle Percentages
In this math worksheet, students analyze 12 circles which have been divided into 2 or more sectors. Inside each part, students write the percentage of the whole circle that each sector represents.
Curated OER
Circles and Squares: Lemonade Picture
In this shapes and colors worksheet, students analyze a picture of a glass of lemonade and trace all the circles and squares. Students color the shapes according to the directions.
Curated OER
Identify and Circle the Objects – Big or Small
In this big and small worksheet, students circle objects that are either big or small for whichever question is asked. Students complete 20 problems total.
Curated OER
Syllables: Circle words with one syllable
For this syllables worksheet, students read through a list of 20 different words and circle the ones that contain only one syllable.
Curated OER
Spelling: circle the incorrectly spelled word
In this spelling learning exercise, students read through 5 problems that each contain 3 words. They circle the word that is spelled incorrectly.
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