Definition and properties of the central angle of a circle
Math Open Reference

Area of an annulus. Definition and formula
Math Open Reference

This website shows how to find the area of a ellipse.
Math Warehouse

This page gives two methods for finding the area of a kite: a geometry formula and a trigonometric formula. Numerous connected pages offer a wide variety of information on all types of polygons.
Math Open Reference

In this Early Edge video lesson, you'll learn more about Rectangles: Area, so you can be successful when you take on highschool Math & Geometry.
The Princeton Review

In this Early Edge video lesson, you'll learn more about Area of a Circle, so you can be successful when you take on highschool Math & Geometry.
The Princeton Review

Area enclosed by a circle. Definition and formula
Math Open Reference

Worksheet to practice calculating surface area for rectangular prisms.
Helping with Math

Worksheet to practice using the formula for the area of a circle.
Helping with Math

Comprehensive list of formulas for finding the area, volume and surface area of various shapes.
Math2
