Lesson Plan
Curated OER

Surface Area of Spheres

For Teachers 9th - 12th
Learners identify the properties of a sphere. In this geometry lesson, students calculate the surface area of spheres using the formula derived by nets. They identify the radius and diameter of the sphere.
Worksheet
Curated OER

Basic Circle Worksheet

For Students 3rd - 5th
In this circle worksheet, students identify center, radius and diameter of three circles. An answer key is included on page 2.
Worksheet
Curated OER

Angular Size and Velocity

For Students Higher Ed
In this distance worksheet, students calculate the angular size or angular diameter of objects at a given distance. This worksheet has 6 problems to solve.
Worksheet
Curated OER

Perimeter, Circumference and Area

For Students 9th - 11th
In this measurement worksheet, students identify the area, perimeter and circumference of a diagram. They also find the size of a pond based on the diagram shown on the sheet. Finally, students calculate how much carpet is needed to be...
Lesson Plan
Willow Tree

Perimeter of Common Geometric Figures

For Students 8th - 11th Standards
Help learners understand that perimeter and circumference are one in the same. Learners apply their skills to determine the perimeter/circumference of triangles, rectangles, and circles. They then use the same strategy to find the...
Activity
101 Questions

Trashketball

For Teachers 9th - 12th Standards
Take a shot using a lesson on volume! Young learners watch a video showing a trashcan filling with paper balls. The task is to calculate the number of paper balls that will fit in the can. Pupils use volume calculations to make a...
Lesson Plan
Virginia Department of Education

Circles in the Coordinate Plane

For Teachers 9th - 11th Standards
Make the connection between the distance formula and the equation of a circle. The teacher presents a activity on how to use the distance formula to derive the equation of the circle. Pupils transform circles on the coordinate plane and...
Interactive
CK-12 Foundation

Equations of Circles: The Sea of Happiness

For Students 11th - Higher Ed Standards
Map this! Help your young mathematicians draw a circular island on a map. Given specifics of the location and size of an island on a map, pupils transform a circle to meet the given requirements. They then determine the location of the...
Assessment
1
1
Balanced Assessment

Bicycle Chain II

For Students 9th - 12th Standards
Apply geometric concepts to a design problem. Individuals examine the structural setup of the chain on a bicycle and use the measurements of the circles to determine the length of the chain. 
Worksheet
1
1
K12 Reader

Anatomy of a Circle

For Students 4th - 5th Standards
Make sure your learners are well-versed in circles with a reading passage. Pupils will pick up some important circle-related terms as they read and respond to the five included questions.
Activity
101 Questions

Car Caravan

For Students 6th - 8th Standards
Keep playing with those old toy cars! Pupils estimate the number of toy cars in an art installation. The only information they receive is a picture showing the toy cars arranged in concentric rings and the diameter of the overall...
Activity
Didax

Pi Day #1a – Discovering Pi

For Students 6th - 10th Standards
Unravel the mystery behind the infamous number pi. Scholars complete a series of activities that explores where pi comes from, its digits and estimation strategies. Pupils should be ready to measure, calculate, and look for patterns to...
Activity
Exploratorium

Peripheral Vision

For Teachers 4th - 6th
Life science learners discover the range of peripheral vision. They compare the angles at which they can detect motion, colors, and detailed shapes. 
Assessment
EngageNY

Geometry Module 5: Mid-Module Assessment

For Teachers 9th - 12th Standards
How can you formally assess understanding of circle concepts? Pupils take a mid-module assessment containing five questions, each with multiple parts.
Unit Plan
Mathematics Vision Project

Module 5: Modeling with Geometry

For Students 9th - 12th Standards
Solids come in many shapes and sizes. Using geometry, scholars create two-dimensional cross-sections of various three-dimensional objects. They develop the lesson further by finding the volume of solids. The module then shifts...
Worksheet
Curated OER

Quiz: Area of a Circle

For Students 7th - Higher Ed
Geometers test their mastery at finding the area of a circle with 10 basic problems. Circle diagrams show line segments, points, and diameter. Distance of radii are given. They use pi as 3.14 to calculate the area. No answer key is...
Lesson Plan
Curated OER

Volume of Cones

For Teachers 9th - 12th
Learners identify the volume of cones and pyramids. In this geometry lesson, students derive the formula for cones and pyramids. They calculate the volume of cones and other three dimensional shapes.
Lesson Plan
Curated OER

Power of a Point

For Teachers 9th - 11th
Students solve problems by finding the radius or diameter. In this geometry lesson, students identify the tangent line of a circle and use properties of circles to find the radius. They relate circles to the real world.
Lesson Plan
Curated OER

"Where Does Pi Come From?"

For Teachers 5th
Fifth graders explore geometry by exploring Pi. In this circle measurement lesson, 5th graders identify the relationship between the radius, diameter and circumference of a circle and how Pi is the key to unlocking any circular...
Worksheet
Curated OER

Circles

For Students 9th - 10th
In this geometry worksheet, learners solve problems by finding the diameter, radius and chord of a circle. They also solve for the area of the circle. There are 10 questions with an answer key.
Lesson Plan
Curated OER

Equations of Circles

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

Graphs of Circles

For Students 10th
In this graphs of circles worksheet, 10th graders solve 10 different problems that include the graphs of circles with various measurements. First, they write the equation of a circle whose diameter is a given number and whose center is...
Interactive
Curated OER

Ten Multiple-Choice Circle Problems

For Students 9th - 10th
In this circle learning exercise, students solve ten multiple-choice questions concerned with the area, radius, diameter, and circumference of a circle.  The solutions are provided by clicking on the "show answers" button on the...
Worksheet
Curated OER

Blank Circles

For Students 5th - 8th
In this circles worksheet, students complete the radius, diameter, and circumference for each circle with one answer given to them. Students complete 4 problems.

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