Having trouble understanding geometry? Do vectors, parallelograms and number-filled proofs just make your head spin? Full of engaging stories and practical, real- world explanations, Head First Geometry will help you learn everything from the quadrilateral equation to exploring three-dimensional shapes to finding similar triangles. Along the way, you'll go beyond solving hundreds of repetitive problems, and actually use what you learn to make real-life decisions. You've found a really cool design to etch on the back of your new iPhone, but will it actually fit on there? Learn how to put Geometry to work for you, and nail your class exams along the way. Why waste your time struggling with new concepts? By using the latest research in cognitive science and learning theory to craft a multi-sensory learning experience, Head First Geometry uses a visually rich format designed for the way your brain works, not a text-heavy approach that puts you to sleep.