The Development of Basic Geometric Construction Skill of Mathayomsuksa 1 Students Using the STAR Strategy with the Geometer’s Sketchpad Program (GSP)

Abstract

The purposes of the study were to 1) develop the basic geometric construction lesson plans using the STAR strategy with the GSP program at the effectiveness criteria of 80/80, and 2) compare students’ learning achievement on basic geometric construction before and after using the STAR strategy with the GSP program. The sample group was 33, from Mathayomsuksa 1/2 students who have studied in the second semester of the 2022 academic year at Cholpratan Anukroh school, Wang Noi district, Phra Nakhon Si Ayutthaya province. The research instruments consisted of the basic geometric construction lesson plans using the STAR strategy with the GSP program, and the learning achievement test on basic geometric construction. The statistics used to analyze data were mean, standard deviation, and paired sample t-test. The results of research were as follows: 1) the effectiveness criteria of the basic geometric construction lesson plans using the STAR strategy with the GSP program was 83.35/80.30, and 2) the students’ learning achievement on basic geometric construction after using the STAR strategy with the GSP program was statistically higher than before at 0.05 level.