Unit Plan
Texas Education Agency

Texas Gateway: Applying Geometric Probability

For Students 9th - 10th
The student will find the area of polygons and circles. Then, the student will use probablity to solve real-world problems.
Activity
Analyze Math

Analyze Math: Polygons Problems

For Students 9th - 10th Standards
Here are four problems about the area of a regular polygon. Start by finding the area of a hexagon inscribed in a circle of radius 10, and end by proving that as the number of sides of the polygon increases, the area of the polygon...
Interactive
Calculator Soup

Calculator Soup: Circle Calculator

For Students 9th - 10th Standards
Use this circle calculator to find the area, circumference, radius, or diameter of a circle. Given any one variable A, C, r or d of a circle you can calculate the other three unknowns.
Whiteboard
ClassFlow

Class Flow: Circles

For Teachers 6th - 8th Standards
[Free Registration/Login Required] This flipchart has information and practice regarding finding area and circumference of circles.
Handout
Math Words

Math Words: Right Circular Cylinder

For Students 9th - 10th
Find a picture of a right circular cylinder here with the formulas for volume, total surface area, and lateral surface area. Site by MathWords.com.
Activity
Texas Instruments

Texas Instruments: Numb3 Rs: Meltdown

For Teachers 9th - 10th
Based off of the hit television show NUMB3RS, this lesson has students explore the relationship between a circle's area and it's radius. This is framed in the context of a scene in where a pile of ice is melting into an increasingly...
Whiteboard
ClassFlow

Class Flow: Dimensions

For Teachers 9th - 10th Standards
[Free Registration/Login Required] Students learn what surface area is on geometric figures, and find volume, lengths, and areas of figures.
Unknown Type
Khan Academy

Khan Academy: Radius and Diameter

For Students 7th Standards
Practice problems finding radius and diameter of a circle.
Graphic
Curated OER

Web Math: Find Out Things About Circles

For Students 3rd - 8th
WebMath offers a great site for students to practice finding the diameter, area and circumference of a circle.
Interactive
Shodor Education Foundation

Shodor Interactivate: Single Fraction Pointer

For Students 9th - 10th
Determine the value of a given fraction represented as a point on a number line. Then find a fraction whose value is the given fraction using an arrow on the number line as a guide.
Interactive
PBS

Pbs Learning Media: Square Wheeled Tricycle: Radius and Circumference

For Students 6th - 8th
This interactive exercise focuses on working with the radius of various circles to find the circumference and area as well as challenging you to find the distance a square wheel travels around the track.
Unit Plan
Khan Academy

Khan Academy: Radius and Diameter

For Students 6th - 8th
Practice finding the radius and diameter of a circle using both vocabulary and visuals. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.
Handout
Calculator Soup

Calculator Soup: Annulus Calculator

For Students 9th - 10th
This online calculator will find the area, circumference, and radii of an annulus. With any 2 known variables, you can calculate the other 5 unknowns.
Unit Plan
Cut the Knot

Cut the Knot!: Polygons: Formality and Intuition

For Students 9th - 10th
This is a very interesting site about polygons. The site begins by distinguishing between shapes whose sides intersect and polygons whose sides do not overlap. After this short introduction, you will find information regarding area and...
Unknown Type
Common Core Sheets

Common Core Sheets: Geometry 8.g.3 Worksheets: Coordinate Plane

For Teachers 8th
Worksheets provide practice with finding the area or circumference of a circle and answer keys are provided. You can even create your own worksheet or flashcards.