The Fibonacci spiral is based on the Fibonacci sequence to construct a curve forming a spiral. This spiral and some variants appear in the constructions of live entities. In this article we present a computed, interactive version of this spiral with the help of Dr. Geo, an interactive geometry and programming application. Later we discuss on the interest of this approach in mathematics secondary teaching.
Leonardo Fibonacci, Italian merchandiser, book keeper, mathematician from the XIII century, is well known for his Fibonacci sequence, whose terms are called Fibonacci numbers. He made far more mathematical contributions than this sole sequence. He introduced in Europe the Arab digits and its positional system to construct our contemporary numbers, he wrote several treaties on mathematics and accounting.