GEOMETRIC FIGURES FAST FACTS:

Take me to an interactive tutorial involving circumference and area of circles. Take me to an interactive tutorial involving perimeter and area of polygons:  squares, rectangles, parallelograms, triangles, and trapezoids. Take me to a site that will give me some nice reference materials and a few memory aids. How about a site that is a comprehensive study guide for geometry-related topics ranging from: right triangles, similar polygons, ratios in special right triangles, Pythagorean Theorem, Trigonometric ratios, circles, coordinate geometry, lines, quadrilaterals, polygons, and more.

A rectangle: Perimeter equals two times the length plus two times the width; Area equals the length times the width.

P = 2L + 2W

A = LW

A square: Perimeter equals four times the side; Area equals the side squared.

P = 4S

A = S²

A circle: Diameter equals two times the radius; Radius equals diameter divided by two; Circumference equals pi times diameter or two times the radius times pi. Area is pi times the square of the radius.

(pi equals approximately 3.14)

d = 2r ; r = d/2

C = 3.14d ; C = (2)(3.14)r

A = 3.14r²

A triangle: Perimeter equals the sum of the three sides. Area equals one half the base times the height.

P = S₁ + S₂ + S₃

A = (1/2)bh

That's it?   I thought there'd be more.   What a bummer!

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