Hodiyanto, Mega Teguh Budiarto, Rooselyna Ekawati
Quadrilaterals are prerequisites for learning space geometry, so it is necessary to know the geometric abilities of quadrilaterals to learn space geometry successfully. These tests will also help identify students’ level of mastery of the quadrilateral concept and provide information for teachers and researchers in planning teaching, learning and research. This research method adapted test development research: test conceptualisation, test construction, test tryout, and item analysis. There were three validators. 120 8th-grade students in West Kalimantan, Indonesia, participated. Item analysis was carried out with Iteman 3.0 software. The geometric ability instrument is valid and reliable because the Scale Content Validity Index (S-CVI) is 1, and the reliable coefficient is 0.757. 21 items have a discrimination index above 0.3 and 3 items below 0.3. The distractors worked fine; only a few distractors did not work fine. Thus, this instrument can be used for geometric ability tests. © 2024, Adam Marszalek Publishing House. All rights reserved.
Universitas Negeri Surabaya, Indonesia
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