Radius Teacher Resources

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A fabulous four-page assignment explores volume formulae for rectangular prisms, cylinders, cones, and pyramids. Pupils apply the formulas to solve problems, match diagrams to values, and address real-world scenarios. A detailed answer key shows step-by-step how to arrive at the correct result. This is a colorful and attractive assignment to add to your curriculum arsenal!
A very basic presentation on the vocabulary associated with circles has come around. Math whizzes see definitions and examples of the radius, diameter, chord, and central angle of a circle. The last slide says "practice time," but there are no problems present! You'll have to have to add some in or have a handout ready for reinforcement.
Get your class thinking about geometry in their own bedrooms! Solving geometry challenges, individuals match words and definitions, find perimeter and area in their homes (rectangular, circular, and triangular), find circumference and area of welcome mats, use formulas to find surface areas and volumes of 3D shapes, and use a calculator to calculate the height of a can using the cylinder formula. There are three different take-home activities, all on colorful, professionally-designed handouts.
Your class will use a set scale to convert diameters of planets to the model size, the diagram given to expand on the number of planets drawn as concentric circles, and examine the scale that would be needed to fit the larger planets on a page.  The out-of-this-world activity is can be used to examine the planets, math scales, and ratios. You could expand on this with astronomy topics, but the worksheet also goes on to practice more scales used in the area of blueprints and architecture
This is a multi-faced unit that looks at circles, arcs, sectors, cylinders, cones, spheres, and hemispheres. The formulas for finding length, area, surface area, and volume are discussed with an eye towards an intuitive understanding. Vocabulary is also stressed. This unit is organized to easily use only the parts you need. 
This unit covers the basic trigonometry including understanding radians, how to convert between radians and degrees, the area of a circle subtended by an angle, basic properties and graphs of sine, cosine, tangent, and solving trigonometric equations. Activities, problem sets, and answers are given. 
Young mathematicians identify central angles, arcs and radius of circles in this pre-calculus lesson plan. They identify the proportion of the circle based on its radius while they convert between degrees and radians measurements.
In this circles worksheet, learners calculate either the radius, diameter and circumference of a set of 4 circles, one measurement is given for each circle, students calculate the remaining 2. 
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.
Students write the equation of a circle. In this geometry lesson, students check the solution of a coordinate pair by evaluating them. They graph the circle given the equation and radius.
Pupils explore circumference manipulating Moon Pie wrapper. In this geometry lesson, they manipulate snack wrappers to find circumference, diameter, radius and distance.
Middle and high schoolers listen to a scenario about a puppy and use the scenario to develop formulas in order to find the area of a circle. In this circumference activity, pupils understand how to find the radius, diameter, area of a circle, and circumference. They use the Thinkfinity tool to investigate circles, input data and create a table, and use the formulas to solve problems.
Learner use three random locations on the coordinate system and simplify the expression and assign result to the variable loc. They substitute guesses for the center and radius of the circle in the equation for the center of a circle and plot the result and solve for the radius, and the coordinates of the center.
Students build a family of cylinders and discover the relation between the dimensions of the generating rectangle and the resulting pair of cylinders. They order the cylinders by volume and draw a conclusion about the relation between dimensions & vol
Your class examines a series of shapes and discusses how we know that they are not circles. In this way, you begin to acquaint them with the properties and parts of this geometric figure. Then, teach them how to use a protractor to produce circles with specified diameters. This is a well-rounded exercise!
Pupils explore the concept of dimension and its affect on overall volume. They construct rectangular prisms out of paper, then fill their prisms with popcorn. By transferring the same amount of popcorn to various prisms, they are able to compare the different sizes. This makes the concept of volume not only visual for your class, but also quite tasty!
In this Algebra II/Geometry lesson, young scholars investigate the problem of maximizing the volume of a cone. They build concrete models and calculate the volume. Pupils use technology to construct, gather data, and determine the sector angle that maximizes the volume. 
This lesson starts with geometers discussing how to find the volume of a cone and pyramid, using what they know about the volume of a cylinder or prism. Then, using the formulas, they calculate the volume of cones and other conics using the correct formula. 
Students explore the concept of circles.  In this circles lesson, students use their Ti-Nspire to collect data on various circles of different sizes.  Students measure the diameter and circumference of the circles and plot the data in a scatter plot of diameter v. circumference.  Students find the slope of the line to be Pi.
This compendious collection of slides leaves no questions when it comes to the concept of atomic size. Thorough and easy-to-read graphs, tables, and graphics explain atomic radii, the shielding effect, the octet rule, isoelectric species, and electron-dot notation. There is enough material here to support more than one day's worth of lessons for your budding chemists.

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