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.

### Introduction

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.

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