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Lesson Plan
EngageNY

Arc Length and Areas of Sectors

For Teachers 9th - 10th Standards
How do you find arc lengths and areas of sectors of circles? Young mathematicians investigate the relationship between the radius, central angle, and length of intercepted arc. They then learn how to determine the area of sectors of...
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Lesson Plan
Houghton Mifflin Harcourt

Developing Formulas for Circles and Regular Polygons

For Teachers 6th - 10th Standards
Formulas and procedures for finding the area and circumference are not provided on this handout, so it will be best used as a practice of already-acquired skills. It is a well-rounded assignment, however, as it includes diagrams,...
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Activity
Primary Resources

Drama Warm Ups and Circle Games

For Teachers 2nd - 12th
Circle games, energetic games, calming games, exit games. Whether used as ice breakers, warm ups, or exit strategies, or used in drama classes or content areas, the 28 games detailed in this packet deserve a spot in your curriculum library.
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Lesson Plan
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Curated OER

Collaborative Literature Circle For the 21st Century

For Teachers 4th - 6th
Using ichat or Edmodo 4th -6th graders participate in an inter-school literature circle. Students from two different schools pair up online through ichat and use a blog to conduct a book circle. This lesson plan is wonderful; it fully...
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Worksheet
Curated OER

All About Circles Post Test

For Students 7th - 9th
For this geometry worksheet, students answer ten multiple choice facts about circles. The questions include finding the diameter, area, and radius of a circle.
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Lesson Plan
Texas Instruments

Areas of Regular Polygons and Circles

For Teachers 9th - 12th Standards
Learners explore area of polygons and regular polygons in this math instructional activity. They calculate the area of several polygons using Cabri Jr. and analyze shapes and write formulas to solve for the area.
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Worksheet
Curated OER

Circles

For Students 9th - 10th
In this geometry activity, students 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.
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Worksheet
Curated OER

Area of 2D Shapes

For Students 9th - 12th
For this area worksheet, students commence solving for area of squares and rectangles, and continue to parallelograms and triangles, and continue again to rhombi and trapezoids and finish with circles, polygons, and shaded regions. There...
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Lesson Plan
Curated OER

Chords of a Circle

For Teachers 9th - 12th Standards
Teach how to differentiate between chords and perpendicular bisectors. In this geometry lesson, students relate the properties of chords and circle to solving right triangle. They define what makes two chords congruent in side a circle.
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Lesson Plan
Curated OER

Equation of a Circle

For Teachers 9th - 12th Standards
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.
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Lesson Plan
Curated OER

Circles

For Teachers 10th
Tenth graders explore and define the radius and diameter of a circle. In this geometry lesson, 10th graders calculate the circumference and area of a circle using real world objects and shapes. They discuss chords and lines tangent to a...
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Worksheet
Curated OER

Area Review

For Students 9th - 10th
In this geometry worksheet, learners calculate the area and different polygons such as squares, parallelogram, and rectangles. There are 15 questions with an answer key.
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Lesson Plan
Curated OER

Area of Triangle using the Semi-Perimeter and Radius

For Teachers 8th - 10th
Learners investigate the properties of circles. In this geometry activity, students calculate the area and perimeter of a triangle. They identify the perimeter and radius length of a circle.
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Interactive
Curated OER

Word Problems that involve Circles

For Students 9th - 12th
In this online math worksheet, students solve word problems the involve circles. This excellent resource allows the students to check their answers, and to get "hints" should they run into difficulties. A terrific teaching tool!
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Interactive
Curated OER

Area of Shaded Regions that involve Circles

For Students 9th - 12th
In this online math worksheet, high schoolers determine the area of shaded regions within a circle. This excellent resource allows the students to check their answers, and to get "hints" should they run into difficulties. A terrific...
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Worksheet
Curated OER

Circles Area Perimeter and Circumference

For Students 5th - 6th
In this circles worksheet, students calculate to find the area, radius, circumference and perimeter of circles. A reference web site is given for additional activities.
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Worksheet
Curated OER

Circle Area, Perimeter and Circumference

For Students 6th - 8th
In this area, perimeter, and circumference worksheet, students 7 questions that require them to fill in 7 blank circles with the information they are provided and calculate the desired answers.
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Worksheet
Curated OER

Surface Area of Cylinder Worksheet

For Students 6th - 8th
In this surface area worksheet, students are given either the diameter or radius and the height of 8 cylinders. They calculate the surface area.
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Lesson Plan
Curated OER

THE AREA OF A CIRCLE

For Teachers 7th - 12th
Students examine the relationship between circumference and diameter and how to use the formula to find the area of a circle.  In this circle lesson plan students divide into groups and complete an activity. 
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Worksheet
Curated OER

Area of Sectors

For Students 10th - Higher Ed
In this area of sectors worksheet, students find the area of a given sector, area of inscribed figures, and area of shaded regions. This two-page worksheet contains 20 problems. An answer sheet is provided on the third page.
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Lesson Plan
Curated OER

Finding Areas of Triangles, Rectangles, and Circles

For Teachers 9th - 10th
Students find the areas of geometric shapes. In this geometry lesson plan students find and measure the sides, perimeters, and areas of quadrilaterals, triangles, and circles. Students relate the measures to the others by using formulas.
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Worksheet
Curated OER

Circles and Cylinders

For Students 10th
In this circles and cylinders worksheet, 10th graders solve and complete 22 various types of problems. First, they collect data for a radius and circumference for several different circles and calculate the quantity. Then, students find...
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Worksheet
Curated OER

Areas and Probabilities

For Students 9th - 12th
For this area and probability worksheet, high schoolers solve 5 problems where they find the probability of an event occurring. They also use a given photograph of the moon's surface to find the area covered by craters and determine the...
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Lesson Plan
Curated OER

Finding the Area Under A Curve with Random Probability

For Teachers 11th - Higher Ed
Students explore the concept of area under a curve. In this area under a curve lesson, students find the area under a curve using the Monte Carlo method using random points and probability. Students calculate the area under the same...

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