ANALISIS KESALAHAN MAHASISWA PGSD DALAM MEMECAHKAN MASALAH GEOMETRI DITINJAU DARI PRIOR KNOWLEDGE

Abstract

Penelitian ini mengkaji kesalahan mahasiswa dalam memecahkan masalah geometri melalui penelusuran prior knowledge. Penelitian ini merupakan penelitian studi kasus tipe instrumental melibatkan 185 mahasiswa PGSD Universitas Trunojoyo Madura. Subjek menyelesaikan instrumen pelacak prior knowledge dan dilanjutkan pemecahan masalah. Hasil penelitian menunjukkan bahwa 71 (38,37%) gagal menyelesaikan masalah segitiga dan 124 (67,02%) subjek gagal menyelesaikan masalah jajar genjang. Kesalahan menyelesaikan masalah tersebut dikarenakan kesalahan memahami prior knowledge. Kesalahan pemecahan masalah dapat dikelompokkan menjadi empat bentuk yaitu: (1) kesalahan representasi; (2) kesalahan menggambar garis tinggi, (3) kesalahan dalam menggunakan teorema phytagoras, dan (4) kesalahan memahami konteks berbeda. Sebaran kesalahan prior knowledge: 87,75% kesalahan memahami aksioma, definisi dan representasi dalam geometri sebesar; dan 26,49% kesalahan representasi gambar.   Kata kunci: Prior Knowladge, Pemecahan Masalah, Geometri Abstract: This study examines students' mistakes in solving geometric problems through searching prior knowledge. This research is an instrumental type case study involving 185 PGSD students at Trunojoyo University, Madura. The subject completed the prior knowledge tracking instrument and continued problem solving. The results showed that 71 (38.37%) failed to solve the triangle problem and 124 (67.02%) subjects failed to solve the parallelogram problem. Errors in solving these problems are due to errors in understanding prior knowledge. Problem solving errors can be grouped into four forms, namely: (1) misrepresentation; (2) mistakes in drawing heights, (3) mistakes in using the Pythagorean theorem, and (4) mistakes in understanding different contexts. Prior knowledge error distribution: 87.75% error in understanding the axioms, definitions and representations in geometry by; and 26.49% image representation error. Keywords: Prior Knowladge, Problem Solving, Geometry.