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Interactive
Curated OER

Circle Problems - Radius, Diameter, Circumference and Area

For Students 9th - 12th
In this online math worksheet, students determine the radius, circumference, diameter and area of circles. This excellent resource allows the students to check their answers, and to get "hints" should they run into difficulties. A...
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Interactive
Curated OER

Circumference of Circle Worksheets

For Students 6th - 12th
In this online math activity, students determine the circumference of a variety of circles given their diameter. This excellent resource allows the students to check their answers, and to get "hints" should they run into difficulties. A...
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Lesson Plan
Houghton Mifflin Harcourt

Developing Formulas for Circles and Regular Polygons

For Teachers 6th - 10th Standards
Formulas and procedures for finding the area and circumference are not provided on this handout, so it will be best used as a practice of already-acquired skills. It is a well-rounded assignment, however, as it includes diagrams,...
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Worksheet
Curated OER

Calculate Area Using Pi

For Students 7th - 9th
Geometers find the area of four circles given their circumferences. Circumference is presented in the form of "numeral (diameter) x pi"; the answer key shows solutions as  "numeral (radius squared) x pi," so computation is limited to...
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Worksheet
Curated OER

All About Circles Post Test

For Students 7th - 9th
In this geometry worksheet, students answer ten multiple choice facts about circles. The questions include finding the diameter, area, and radius of a circle.
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Lesson Plan
Curated OER

Length of an Arc

For Teachers 11th - 12th
Pupils compute the length of an arc and each hypotenuse in the give figure, adding them up in the end. They then develop the formula for the arc length with respect to the x-axis and the y-axis. Students also develop a formula for the...
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Lesson Plan
Curated OER

Equation of a Circle

For Teachers 9th - 12th Standards
Young scholars write the equation of a circle. In this geometry activity, students check the solution of a coordinate pair by evaluating them. They graph the circle given the equation and radius.
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Worksheet
Curated OER

Exploring Circles

For Teachers 10th
In this exploring circles activity, 10th graders solve 10 different types of problems that are related to determining the different measures of a circle. First, they define a circle and its center. Then, students refer to the given...
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Lesson Plan
Curated OER

Consistent Circles

For Teachers 8th - 12th
Students create a design of a circle. In this geometry lesson, students identify the measure of the diameter and radius of a circle. They graph and analyze their collected data and write equations based on direct variation.
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Lesson Plan
Curated OER

Geometry of Circles - Week 7 (Area & Circumference)

For Teachers 12th - Higher Ed
In this circle worksheet, students solve problems involving the circumference, area and arc length in a circle. They explore the union of circles and semicircles, as well as the line segments tangent to the circle. This two-page...
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Lesson Plan
Curated OER

Geometry of Circles: Week 7

For Teachers 10th - Higher Ed
In this circle worksheet, students determine the number of degrees in a minor arc, find the area of a circle, find the area of a shaded region. This two-page worksheet contains six problems.
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Assessment
Concord Consortium

Bicycle Chain

For Students 10th - 12th Standards
Model a bicycle chain with circles and tangent lines. Given the dimensions of the sprocket wheels, young scholars calculate the length of the chain that surrounds them. A second task has learners write a function for the length of a...
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Lesson Plan
Curated OER

Radius, Diameter and Circumference

For Teachers 8th - 10th
In this circle worksheet, students use a drawing of a circle. The diameter is given. Students find the radius, circumference and area of the circle. On the second problem, students are shown a circle with a hole inside it. They compute...
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Worksheet
Curated OER

Circles: Circumference and Area

For Students 8th - 11th
In this circle worksheet, students calculate the circumference and area of given circles. They determine the perimeter of a shaded area, and give explanations to support problems. This two-page worksheet contains 3 multi-step problems.
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Lesson Plan
Curated OER

Equations of Circles

For Teachers 10th - 12th
Students will define circle and radius. In this radius lesson,  students are given a circumference, they will write an equation and sketch the circle. Students will match graphs of circles to their equations.   
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Worksheet
Curated OER

Perimeter, Circumference, Volume, and Surface Area

For Students 8th - 11th
In this Perimeter, Circumference, Volume, and Surface Area worksheet, learners are asked to identify geometric formulas and calculate for volume and surface area for geometric solids.  In addition, students are asked to identify...
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Worksheet
Curated OER

Arcs in Circles

For Students 10th
In this arcs in circles worksheet, 10th graders identify 10 different circles and the measurement of their arcs. First, they determine the length of a minor arc to the nearest integer. Then, students determine the radius of a circle...
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Worksheet
Curated OER

Circles

For Students 10th
In this circles worksheet, 10th graders solve 10 different problems that include determining various types of circles. They write the standard form of the equation of the circle with the given radius and center. Then, students solve each...
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Lesson Plan
Curated OER

One Revolution for Robot

For Teachers 8th - 12th
Learners calculate the revolution and circumference of circles. In this calculus lesson, students derive the formulas for their given shape. They use the d=rt to calculate the distance and rate of travel.
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Lesson Plan
Curated OER

Connecting Formulas Related to Geometric Figures

For Teachers 8th - 12th
Students identify diagrams of quadrilaterals and circles by different names and classify the figures. They name the areas for each diagram and practice solving the formulas for each.
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Lesson Plan
Curated OER

Rational and Irrational Numbers 2

For Teachers 9th - 12th Standards
Is the circumference of a circle always, sometimes, or never rational? Learners answer questions individually and also work in groups to look at sums and products of rational and irrational numbers. They must also be able to use the...
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Lesson Plan
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Illustrative Mathematics

Eratosthenes and the Circumference of the Earth

For Teachers 9th - 12th Standards
The class gets to practice being a mathematician in ancient Greece, performing geometric application problems in the way of Eratosthenes. After following the steps of the great mathematicians, they then compare the (surprisingly...
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Performance
Radford University

Discover Radians!

For Teachers 9th - 12th Standards
No need for radians to be mysterious. Scholars use a cardboard cut-out of a unit circle and measure the radius and circumference using a piece of string. They consider the number of radii needed to cover the entire circumference and use...
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Activity
101 Questions

Apple Mothership

For Teachers 9th - 12th Standards
Explore Apple's spaceship office building. Built in the shape of a circle, the office building offers a unique floor plan challenge. Young scholars use the dimensions of the building to estimate the square footage for each employee. 

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