Geometry in the Open Air - Yakov Perelman - Bog

This book intends to arouse the reader's interest in geometry especially teens who see it as a cold abstract area of mathematics. Through simple problems, illustrative examples, and interesting stories, the author uses geometric notions to address situations one may face in the open air. This includes measuring the height of a tree without having to climb it, evaluating the width of a river, estimating the distance of remote objects, etc. The book makes any outdoor tour an entertaining learning experience without the need for any calculations or tables.