Radius Teacher Resources
Find Radius educational ideas and activities
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Circles Notes: Diameter, Radius, Circumference, and Area
A note-taking sheet and homework are paired up in this resource. Through both, your class will learn the definitions for the diameter, radius, area, and circumference of a circle. The notes guide also displays the formulas for computing the area and circumference. Work a few examples with your class, and then assign the rest as homework. A neat and user-friendly document!
New! Using Linear Equations to Define Geometric Solids
Making the transition from two-dimensional shapes to three-dimensional solids can be difficult for many geometry students. This comprehensive lesson starts with writing and graphing linear equations to define a bounded region and calculating the areas and perimeters of the space. Using this as a base, the lesson then has learners revolve these regions to create solid figures and calculate the resulting volume. A real-world example using a bowling ball and visualization software caps off this in-depth instruction.
New! Task: Grain Storage
Farming is full of mathematics, and it provides numerous real-world examples for young mathematicians to study. Here, we look at a cylinder-shaped storage silo that has one flat side. Given certain dimensions, students need to determine the current storage capacity and design a new storage facility to use for an anticipated increase in production. The activity uses knowledge of the Pythagorean Theorem, area of a circle, properties of triangles, understanding of volume, unit analysis, and percentage increase.
Radius and Diameter
For this calculating the radius and diameter worksheet, students observe two circles, one with the radius and calculate its diameter and one with the diameter and calculate its radius and then estimate their circumferences. Students solve 2 problems.
Making Hay While the Sun Shines & Not Losing It in the Rain
Tenth graders explore the volume of a cylinder. In this geometry lesson, 10th graders investigate the volume of a round bale of hay and the percent of loss as the radius of the bale decreases. The lesson includes step-by-step instructions to guide students through the constructions. TI-nspire handheld is required.
Circles, Circles, Everywhere! ID: 8429
Tenth graders explore circles. In this geometry lesson students investigate the relationships between the diameter and circumference of a circle and between the radius and area of a circle. The dynamic nature of TI-nspire provides opportunity for conjecture and verification.
Students model quadratic functions involving conics. In this algebra lesson, students differentiate and identify properties of circles using a robot. They discuss how to calculate the radius and circumference.
Sixth graders review the three parts of a circle: the radius, diameter and circumference. They practice calculating one of the parts given the other two dimensions and their relationship to one another. They use a spreadsheet program to check their chart work.
Covering and Surrounding
Students develop techniques for estimating the area of a circle and use ideas about area and perimeter to solve practical problems. In this area and perimeter activity, students apply the concepts of perimeter and area to the solution of problem. Students apply formulas where appropriate to identify, measure, and describe circles and the relationships of the radius, diameter, circumference, and area.
The Giant Cookie Dilemma
Students explore the concept of area of circles and rings. In this area of circles and rings lesson, students use construction paper and scissors to aid finding the area of circles and rings. Students examine the effect halving a radius of a circle has on the area of the circle.
Parts of a Circle
Sixth graders use yarn, paper plate, and other materials to identify parts of a circle. In this parts of a circle lesson plan, 6th graders identify the circumference, radius, diameter, and other parts of a circle.
Kepler's 3rd Law
Students derive the velocity in a circular orbit of any radius. They derive the Earth escape velocity and prove Kepler's 3rd law for circular orbits # A simple formula for the orbital period in a circular Earth orbit of given radius.
Circumference Of A Circle
In this circumference worksheet, students determine the circumference of a circle when given the diameter or the radius. This three-page worksheet contains 20 problems. This interactive worksheet may be completed on-line or presented in printed form.
Ring Around the Rosie
Students study the law of conservation of momentum and how mass and radius relates to it. In this momentum lesson students know where axes are on their bodies and what type of rotation they have.
Exploring Volume of Cylinders
Tenth graders investigate the volume of a cylinder. In this geometry lesson, 10th graders create three-dimensional cylinders and use a ruler to determine the dimensions. The lesson progresses to the use of the formula to find the volume and allows students to analyze how changing the radius and height of a cylinder affect this volume.
Students explore properties of tangent lines. In this properties of tangent lines lesson plan, students discuss the perpendicular relationship between a tangent line on a circle and the circle's radius. Students use that relationship to determine unknown distances.
Radian Measure - An Analytic Approach
Students discover the ratio between arc length and radius. In this ratio between arc length and radius lesson, students use the Ti-Nspire to determine how arc length and radius are related. Students determine the arc length measure in radians. Students use the arcLen command on the Ti-Nspire to find the arc length measure in radians.
Cylinders and Cones Homework
In this geometry activity, learners solve for the volume or surface area of cones and cylinders given the radius, diameter, or height. There are 25 questions.
Creating and Understanding Circles and Their Parts
Sixth graders explore and construct circles, using such tools as compasses and rulers. They also develop definitions for identifying the center, radius, diameter, chord, and circumference.
Fifth graders calculate the diameters and radius of planets as a book is read to them. In this diameter and radius lesson plan, 5th graders read the book Space Circles and calculate the measurements based on the information in this book.