Abstract
This study aims to develop a Student Worksheet based on H igher O rder T hinking S kills (HOTS) by using the Problem Based Learning model on the Sine and Cosine Rule learning material for class X high school students. The quality of the Student Worksheet refers to the validity of the Learning Implementation Plan and the Student Worksheet. Research and Development (RD Student worksheet based HOTS on the Sine and Cosine Rules learning material which was developed using Problem Based Learning model declared to have valid criteria with an average score 4,1 with a very predicate.
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