Get un-stumped in a hurry! Proofs made easierMake friends with lines and angles, theorems and postulates - and prove itThe proof is in the pudding - and the parallelogram, and sometimes the rhombus. With this friendly guide, youa?ll soon be devouring proofs with relish. Youa?ll find out how a proofa?s chain of logic works and discover some basic secrets for getting past rough spots. Before you know it, youa?ll be proving triangles congruent, calculating circumference, using formulas, and serving up pi.Discover how to: Identify lines, angles, and planes Calculate the area of a triangle Figure the volume and surface area of a pyramid Bisect angles and construct perpendicular lines Work with 3D shapesRyan, Mark is the author of 'Geometry for Dummies', published 2008 under ISBN 9780470089460 and ISBN 0470089466.