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All Journal Pendas : Jurnah Ilmiah Pendidikan Dasar
Joyce Lidya Patricia Daeli
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Analisis Miskonsepsi Nilai π pada Materi Lingkaran dalam Buku Senang Belajar Matematika: Antara Nilai Sebenarnya dan Realitas Irasional Syifa Eriza Nasution; Joyce Lidya Patricia Daeli; Pujiono Sihite; Marcelly Claudia Sagala; Immanuel Simbolon; Wingston Leonard Sihombing
Pendas : Jurnal Ilmiah Pendidikan Dasar Vol. 10 No. 03 (2025): Volume 10 No. 03 September 2025 Terbit
Publisher : Program Studi Pendidikan Guru Sekolah Dasar FKIP Universitas Pasundan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23969/jp.v10i03.33148

Abstract

Understanding mathematical concepts is inseparable from the clarity of their definitions and presentation in textbooks. One fundamental concept that frequently appears in school curricula, from elementary, middle, and high school levels, is the constant π (phi) in the topic of circles. Mathematically, π is an irrational number obtained from the ratio of a circle's circumference to its diameter. However, in practical learning, the value of π is often simplified to or 3.14. This practical presentation has the potential to lead to misconceptions in students, namely, that they assume π is a rational number. This study used qualitative methods with document analysis techniques in the "Happy Learning Mathematics" book. The results of the analysis indicate an emphasis on the use of the value π = or 3.14 without explaining its irrational nature. As a result, students tend to memorize practical formulas and numbers without understanding that these two values are only approximations and that π is an irrational number with infinite decimal places.
Analisis Pemecahan Masalah Geometri Bidang Datar dalam Konteks Lokal dan Tingkat Pemahaman Siswa Kelas XI-7 SMA Negeri 3 Medan pada Materi Segitiga Pujiono Sihite; Immanuel Simbolon; Samuel Tappin Martua Sitorus; Joyce Lidya Patricia Daeli; KMA Fauzi
Pendas : Jurnal Ilmiah Pendidikan Dasar Vol. 11 No. 02 (2026): Volume 11 Nomor 02, Juni 2026 Published
Publisher : Program Studi Pendidikan Guru Sekolah Dasar FKIP Universitas Pasundan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23969/jp.v11i02.47392

Abstract

This study aims to analyze students' problem-solving abilities in plane geometry within a local context and to identify types of human errors made by Grade XI-7 students at SMA Negeri 3 Medan on triangle material. The studyemployed a descriptive qualitative approach with 20 students selected through purposive sampling. Data were collectedthrough a written test consisting of 5 Higher Order Thinking Skills (HOTS) essay questions based on local contexts, completed within 40 minutes, and analyzed using a human error analysis scoring rubric. The results indicate that students' understanding levels vary across indicators: translation, interpolation, and extrapolation. The dominant error types identified include conceptual errors, procedural errors, and careless errors. These findings have important implications for mathematics teachers in designing more contextual geometry learning based on student error analysis.
Co-Authors Immanuel Simbolon KMA Fauzi Marcelly Claudia Sagala Pujiono Sihite Samuel Tappin Martua Sitorus Syifa Eriza Nasution Wingston Leonard Sihombing