Area of a Circle Teacher Resources
Find Area of a Circle educational ideas and activities
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Informal Proofs of the Circumference/Area of a Circle
Use this lesson plan to help your geometers develop informal proofs of the circumference and area of a circle. Working in small groups, students rotate between three stations to complete hands-on activities that illustrate the...
8th - 10th Math CCSS: Designed
The Circumference of a Circle and the Area of the Region it Encloses
Bring your math class around with this task. Learners simply identify parts of a given circle, compute its radius, and estimate the circumference and area. It is a strong scaffolding exercise in preparation for applying the formulas for...
6th - 8th Math CCSS: Designed
How Do You Find the Area of a Circle if You Know the Radius?
There are basically two things you need to know to find the area of a circle. First, you need to use the correct formula. Second, you have to know the value of the radius. If you know these two things then all you have to do is plug the...
3 mins 6th - 8th Math
Areas of Geometric Shapes with the Same Perimeter
Here you have a triangle, square, hexagon, and circle, all with a perimeter of one unit. Eighth graders must attempt to find the area of each and arrange them in order from least to greatest areas. This is a terrific task for applying...
7th - 9th Math CCSS: Designed
Surface Area and Volume of Conics - Cylinders, Cones, and Spheres
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....
8th - 11th Math CCSS: Adaptable
Deriving the Area of a Sector
Geometers use an activity about finding the area of a pizza to develop the formula for the area of a sector of a circle. They use the known formula for the area of a circle to find the area of a pizza with a given diameter. The activity...
9th - 11th Math CCSS: Designed