Geometry For Dummies, 2nd Edition

Get un-stumped in a hurry! Proofs made easier
Make friends with lines and angles, theorems and postulates -- and prove it
The proof is in the pudding -- and the parallelogram, and sometimes the rhombus. With this friendly guide, you'll soon be devouring proofs with relish. You'll find out how a proof's chain of logic works and discover some basic secrets for getting past rough spots. Before you know it, you'll be proving triangles congruent, calculating circumference, using formulas, and serving up pi.
Discover how to:
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Identify lines, angles, and planes
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Calculate the area of a triangle
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Figure the volume and surface area of a pyramid
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Bisect angles and construct perpendicular lines
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Work with 3D shapes