# Finding dr-vector

Keywords: Vector Calculus

### Highlights of the activity

1. This small group activity is designed to introduce $d\rr$, the key to vector calculus, as a geometric object.
2. Students work in small groups to construct $d\rr$ in rectangular and polar coordinates.
3. The whole class wrap-up discussion emphasizes the geometric importance of $d\rr$.

### Reasons to spend class time on the activity

• Constructs $d\rr$ in rectangular and polar coordinates.
• Emphasizes geometric nature of $d\rr$.
• Illustrates infinitesimal reasoning and the use of differentials.

### Student Handouts

Authors: Tevian Dray and Corinne Manogue

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