OER Commons
Oer Commons: Area of a Circle
Seventh graders will compare the formula for the area of a regular polygon to discover the formula for the area of a circle.
George Mason University
Area Formula Lab
In this set of worksheet activities, students will be guided to discover formulas for area of polygonal shapes and circles.
Texas Instruments
Texas Instruments: Finding the Area of Regular Polygons
Students discover a very intuitive method for determining the area of a regular polygon. They use that information to develop the standard area formula.
Alabama Learning Exchange
Alex: Surface Area of Pyramids and Cones
In this inquiry-based lesson, students will discover the formulas for the surface area of pyramids and cones. This lesson plan was created by exemplary Alabama Math Teachers through the AMSTI project.
Alabama Learning Exchange
Alex: Arc Lengths and Sector Areas
Students will work in cooperative groups to discover the relationships between arc length, central angle measure, and circumference. They will also discover the relationship between circle area, central angle measures, and sector area....
Ministry of Education and Universities of the Region of Murcia (Spain)
Ministerio De Educacion Y Ciencia: Actividades Con El Geoplano Formula De Pick
This interactive activity will lead you to the formula that was discovered by G. Pick in 1899. Gather all the data obtained in each of the activities and make a connection between the interior points, the points on the edge and the area...
Texas Instruments
Texas Instruments: How Totally Square Part Ii
Students understand the concept of perimeter of a square, and discover its formula.
BBC
Bbc: Bitesize Review Circle Introduction
Do you need to learn about Pi, circumference, or the area of a circle or just have a quick refresher about them? This British web site will take you through the basics and offers a quick on-line test to help you check your understanding.
Cuemath
Cuemath: Circles
Explore everything about circles. Learn various parts of a circle like a diameter, radius, circumference, circles chord, tangent circles, major arc, segment, sector, and discover other interesting aspects of it. Try your hand at solving...
Wolfram Research
Wolfram Math World: Hemisphere
MathWorld gives a simple and complex definition of a hemisphere. The formula for the volume of a hemisphere is also given.
University of Georgia
University of Georgia: Inter Math: Hemisphere
This InterMath site gives a decription of a hemisphere along with a visual representation. Be sure to use the links to related terms, everyday examples, challenging problems, more information, and the interactive checkpoint involving...