Master teacher Michael Serra knows students love to spot errors. What's Wrong withThis Picture? uses this enthusiasm to exercise the basic skills of geometry and visual thinking. What's Wrong with This Picture? is perfect for warm-up exercises, homework, or group activities.This resource includes 50 black-line masters (W1-W50) with exercises (Angle, Triangle, Circle, Polygon, Area, Volume, Similarity, Trig, and Coordinate Geometry properties) and an answer key. Each page has up to four problems: