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Siti Zaharah, Sahidi, Mukhlas Triono. Analisis Kemampuan Spasial Peserta Didik ditinjau dari Teori Van Hiele Tingkat Informal Deduktif. JPPI [Internet]. 2025 Feb. 14 [cited 2026 Apr. 16];1(1):10-7. Available from: https://ejournal.suryabuanaconsulting.com/index.php/jppi/article/view/189