CK-12 Foundation
Length of a Chord: Distance Across a Ferris Wheel
An interactive presents two friends on a ferris wheel with the task of finding the distance between the them. Pupils create the chord between the two friends and calculate its lengths using trigonometric ratios.
Curated OER
Triads - 7th Chords - Major/Minor Keys - Rhythm
Budding musicians transpose chords, identify major and minor keys, and complete measures to match the shown signatures. This resource can be used as a quiz, test, or as practice for those learning how to read and write music.
EngageNY
Arcs and Chords
You've investigated relationships between chords, radii, and diameters—now it's time for arcs. Learners investigate relationships between arcs and chords. Learners then prove that congruent chords have congruent arcs, congruent arcs have...
EngageNY
Circles, Chords, Diameters, and Their Relationships
A diameter is the longest chord possible, but that's not the only relationship between chords and diameters! Young geometry pupils construct perpendicular bisectors of chords to develop a conjecture about the relationships between chords...
Curated OER
Angles and Arcs formed by Intersecting Chords
In this angles and arcs worksheet, students complete a warm-up, state the formula formed by intersecting chords, and answer eight problems. The worksheet includes a closing think pair share problem.
Curated OER
Congruent Chords, Parallel chords and Perpendicular Chords
In this geometry worksheet, students solve problems about congruent, parallel, and perpendicular chords and bisectors. There are 9 problems with an answer key.
Flipped Math
Chords and Arcs
Congruence breeds congruence. Pupils learn three more circle theorems dealing with congruent chords and arcs. Learners use the theorems to find the measures of chords and arcs in circles by applying previously learned concepts in the...
Curated OER
Tangents, Secants, and Chords
In this tangents, secants and chords worksheet, 10th graders identify and solve 48 different problems that include using 3 different theorems for defining circles. First, they determine the area of each circle with C as the center and a...
Curated OER
Cabri Jr. Perpendicular Bisector of a Chord
Your learners will construct the perpendicular bisector of a chord. They use Cabri Jr. to construct a circle and a perpendicular bisector of a chord. They then measure lengths of the chords and perpendicular bisectors. Learners use...
Curated OER
Segments Formed by Intersectiong Chords, Secants, and Tangents
Learners investigate the properties of segments formed which chords, secants, and tangents, intersect. The dynamic nature of Cabri Jr. allows students to form and verify conjectures regarding segment relationships.
Curated OER
Circles:Tangents and Chords
In this circle worksheet, students solve classic chord-chord angle problems with the angle on, in, and outside the circle as well as chord-tangent problems. There are 20 questions.
Curated OER
Circles and Cylinders
In this geometry lesson, 10th graders break down a circle and identify the different parts. They discuss chords, diameter, radius, circumference, major and minor segment. There are 42 problems broken down into 5 different sections.
Curated OER
Music Composition
Are your learners ready to compose their own music? If so, this instructional activity will help them do it. The sheet is broken into several staffs where they write the tune, riff, and chords. They can put them together to create a...
Curated OER
Chords of a Circle
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.
Curated OER
Properties of Arcs, Lengths and Chords
Learners differentiate between the different properties of arcs, arc lengths, chords, and chord lengths. In this circles lesson, students calculate the arc length of a given circle, and find the measure of the inscribed angles of a...
Curated OER
Chords and Triads
In this music worksheet, students answer 15 questions related to chords and triads. For example, "A triad is a ...that is made up of three notes."
Curated OER
Chords
In this chords music worksheet, students match 7 terms to their descriptions and respond to 7 fill in the true and false questions.
Curated OER
Arcs and Chords
In this arcs and chords learning exercise, 10th graders solve 6 different problems related to determining the arcs and chords of various circles. First, they define the 3 theorems that state the relationships between arcs, chords, and...
Curated OER
Arcs and Chords
In this arcs and chords learning exercise, 10th graders solve 7 different types of problems related to identifying arcs and chords in a circle. First, they find the measure of each arc to the nearest tenth, if O is the center point....
Curated OER
Arcs and Chords Homework
In this geometry activity, students examine a circle with chords and apply formulas to solve for the missing segments or arc. There are 9 questions.
Curated OER
Arcs and Chords
In this circles worksheet, learners find missing arc lengths and chords. Students also find the length of radii in three problems.
Music Teaching Resources
Identifying Major and Minor Triads 1
Here's a major and minor triads worksheet that asks young musicians to name the root, third, and fifth notes and the chord the notes produce.
Curated OER
Tonic Chord in "The Star-Spangled Banner" (Grades 5-8 Chorus).
Learners demonstrate perception of the root, third and fifth of the tonic chord by appropriate movement responses. They analyze and describe music. Students listen to the middle C played on the keyboard and sing to it on the syllable do.
Curated OER
Shot Put Arc
Students complete Part A: Dissecting a Circle. They generate their own chords within the circle. Students measure the various parts of the arc in the shot put pit. The first two measurements, the chord and distance from the midpoint of...
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