Save Big on Coursera Plus. 7,000+ courses at $160 off. Limited Time Only! Grab it Learn how to solve a practical geometry and algebra word problem involving proportions and similar triangles in this 15-minute math tutorial. Work through a real-world example calculating shadow lengths by applying mathematical principles to determine how long a shadow a 6-foot tall man casts when standing next to a 75-foot tree with a 200-foot shadow. Master problem-solving techniques useful for middle school, high school, college-level mathematics, test preparation, and teacher certification exams.