+
Worksheet
Curated OER

Calculate the Circumference

For Students 7th
In this calculate the circumference instructional activity, 7th graders find the circumference given the diameter of 4 circles; the formula and the answers are provided.
+
Organizer
Curated OER

Calculate the Radius

For Students 6th
In this calculating radius worksheet, 6th graders find the radius of 5 circles given the circumference information. Students must write the radius on the line provided and a box is provided to them to show their work. 
+
Organizer
Curated OER

Calculate the Diameter

For Students 6th
In this diameter worksheet, 6th graders find the diameter of 5 circles. Students are given the formula for circumference and circumference information along with a blank box to complete their work. 
+
Worksheet
Curated OER

Find Radius of the Circles

For Students 5th - 6th
In this finding the radius of circles worksheet, students must calculate the radius of 4 circles. Students are given diameter and must write the radius on the line for each circle. 
+
Worksheet
Curated OER

Arc and Angles Formed by Secants and Tangents

For Students 9th - 11th
In this calculus worksheet, students solve problems by finding the line of tangency and measure of the arcs and angles form by a secant line. There are 9 questions.
+
Worksheet
Curated OER

Mixed Review on Formulas & Theorems on Geometry of Circles

For Students 10th
In this geometry worksheet, 10th graders review the formulas and theorems on circles.  Problems are comprehensive and detailed.  The worksheet is eleven pages long and contains nine problems.   Not all answers are included. 
+
Worksheet
Curated OER

A Different Proof of the Law of Cosines

For Students 9th - 12th
In this proofs worksheet, students construct 1 proof of the law of cosines.  Students construct a right triangle within a circle to  prove the law of cosines.
+
Lesson Plan
Curated OER

Circle Circus

For Teachers 3rd
Third graders find the radius and diameter of a bubble. In this radius and diameter activity, 3rd graders create bubbles on their desk and find the radius and diameter of the bubble. Students work in partners to define circle terms and...
+
Interactive
Curated OER

Arcs and Angles Formed by a Tangent and a Chord

For Students 10th
In this math worksheet, 10th graders solve problems involving a tangent line intersection the arc and forming various angles. There are 6 problems to be solved.
+
Lesson Plan
Curated OER

Calculation the Cricumference of Earth using "Google Earth"

For Teachers 8th
Eighth graders investigate properties of circles.  In this eight grade mathematics instructional activity, 8th graders apply proportional reasoning to data gathered with “Google Earth” to calculate equatorial and polar circumference of...
+
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...
+
Lesson Plan
Curated OER

Area and Perimeter of Regular Polygons - An Extension

For Teachers 9th - 12th Standards
Pupils explore the relationship between area and perimeter of polygons.They measure the area and perimeter of regular polygons inscribed in a circle. Learners then discuss how as the number of sides of a regular polygon increase, the...
+
Lesson Plan
Curated OER

Segments Formed by Intersectiong Chords, Secants, and Tangents

For Teachers 9th - 12th Standards
Learners investigate the properties of segments formed which chords, secants, and tangents, intersect. The dynamic nature of Cabri Jr. allows high schoolers to form and verify conjectures regarding segment relationships.
+
Lesson Plan
Curated OER

Cabri Jr. Perpendicular Bisector of a Chord

For Teachers 9th - 12th Standards
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...
+
Lesson Plan
Curated OER

Circles all Around

For Teachers 6th - 8th Standards
Students investigate circles. In this middle school mathematics lesson, students explore the relationship between the diameter of a circle and its circumference.
+
Lesson Plan
Curated OER

Circumscribing a Circle About a Triangle

For Teachers 9th - 12th Standards
Pupils circumscribe a circle about a triangle. They construct a triangle using Cabri Jr and then circumscribe it. They then use knowledge of perpendicular bisectors and circumcenters to locate the center of the circle and then...
+
Lesson Plan
Curated OER

Parachutes, Circles and Pi...Oh My!

For Teachers 6th - 7th
Learners explore different size circles to discover the relationship between diameter and circumference. In this circles and Pi lesson, students construct simple parachutes using circle patterns of varying sizes. Learners predict the...
+
Lesson Plan
Curated OER

3.14159265

For Teachers 9th - 12th
Students discover the value of Pi.  In this value of Pi lesson, students measure the circumference and diameter of various circles on their graphing calculator.  Students find the ratio of the circumference to the diameter and plot the...
+
Lesson Plan
Texas Instruments

Exploring Tangents

For Teachers 9th - 12th Standards
Explore the concept of tangent lines. In this tangent line lesson, learners graph a circle and two lines on their graphing calculator using Cabri Jr. Students construct the lines so that they both intersect at a given point and are both...
+
Lesson Plan
Curated OER

Equations of Circles

For Teachers 9th - 12th Standards
Using Cabri Jr. students construct a circle and determine the equation of the circle they drew by finding the center and the radius. Students use the distance formula to derive the equation of their circle.
+
Worksheet
Curated OER

Addition of Shapes

For Students 1st - 2nd
In this addition worksheet, learners count, write and add together 6 sets of different color-coded shapes in the boxes provided. Students totals will average between 10 and 18.
+
Lesson Plan
Curated OER

Phenomenological Pizza

For Teachers 5th - 8th
Students explore measurement in terms of pizza toppings. In this math lesson plan, students draw a circle using string and a ruler, determine areas of different size circles, find how many two topping pizzas can be made using 14...
+
Worksheet
Curated OER

Circle Identification

For Students Pre-K - K
In this recognizing circles worksheet, students trace different sizes of circles, the singular word circle and the plural word circles. Students complete six tracing activities.
+
Worksheet
Curated OER

Circles - Word Problems

For Students 6th - 7th
For this geometry problem solving worksheet, students answer 8 words problems based on their knowledge of circles, circumference, radius, diameter, and perimeters. They show their work on the sheet between problems.