Radius Teacher Resources

Find Radius educational ideas and activities

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Students will examine the layers of the Earth. In this geology lesson, students create a scale model of the Earth's interior using cash register tape. They will determine the percentage of error in the scale compared to the actual size of the earth's radius.
In this algebra worksheet, 11th graders identify parts of a parabola and circle. They solve systems of equations and answer questions about radius, foci and conics. There are 20 questions on this test. 
In this calculus lesson, learners build a family of cylinders and explore the relationship between the dimensions of the generating rectangle and the resulting cylinders. They write the volumes of cylinders as a function of the radius and use derivatives to find the cylinder with the greatest volume, given a fixed perimeter.
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.
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. 
Learners 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.
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 instructional 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.
Students explore the concept of area of circles and rings. In this area of circles and rings lesson plan, 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.
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.
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.
In this circumference worksheet, learners 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.
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.
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, 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.
Students discover the ratio between arc length and radius.  In this ratio between arc length and radius instructional activity, 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.
In this geometry worksheet, high schoolers solve for the volume or surface area of cones and cylinders given the radius, diameter, or height. There are 25 questions.
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.
Fifth graders explore geometry by listening to a book read in class. In this space measurements lesson, 5th graders read the story Space Circles in class and identify the different planets that make up our Solar System. Students perform calculations of the radius and diameter of specific planets in order to find their circumference.

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