Teaching the Law of Cosines in Advanced 10th Grade Geometry Textbook by Way of Problem-Based Learning in Vietnam

Giang Ngoc Nguyen

Abstract


The law of Cosines is an essential theorem in mathematics in particular and in science in general. The Cosine Rule allows us to calculate the length of one side of a triangle when we know two sides and the angle between the other two sides. This theorem is one of the first theorems when people want to build trigonometric systems. Because of such importance, many people studied the Law of Cosines. In Vietnam, they taught the Law of Cosines in the 10th-grade Geometry program. It appears in Basic and Advanced sections, after having learned some concepts about vector operations. Although it is a famous theorem, there are not many documents mentioning how to teach the Law of Cosines effectively. We need to understand the relationship between mathematics and other fields expressed by the Law of Cosines, as well as to apply the method of problem-based learning in teaching this theorem.

https://doi.org/10.26803/ijlter.18.11.24


Keywords


Law of Cosines; problem-based learning; a real problem; Informatics; Physics

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References


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