Truth About Pi, Above Level Reader Grade 6

Toward the end of the afternoon on Tuesday, Mr. Griffin asks the students in his class to think about circles again. That morning they reviewed circumference and diameter of circles. Now Mr. Griffin wants to talk about the ratio pi. “The ratio pi has fascinated people for thousands of years,” he tells the class. “For more than 4,000 years, people have known that the ratio of the circumference of a circle to its diameter is pi. While no one knows for certain who first calculated pi, we do know that Ancient Greek and Chinese mathematicians used this value. Some mathematicians think that the Egyptians used pi when they built the pyramids.”