Illustrative Mathematics
Illustrative Mathematics: 7.g Designs
In this lesson plan, 7th graders use the formula for circles to determine the area and perimeter.
Illustrative Mathematics
Illustrative Mathematics: 7.g Stained Glass
In this lesson plan, 7th graders use formulas for area and circumference to solve the word problem.
National Council of Teachers of Mathematics
The Math Forum: Volume and Surface Area of a Cone Frustum
This question and answer site deals with the derivation of the formula for the surface area for the frustum of a right circular cone.
Khan Academy
Khan Academy: Circumference and Rotations
Practice these problems with circumference and rotations.
Math Words
Math Words: Right Cone
Math Words defines a cone with a picture and formulas for volume given the hieght and base area of the cone.
Math2
Math2
This is a site for students and teachers of all grade levels. If you are looking for math tables, general information about math topics, or you would like to ask a question, this is the site to visit.