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proof landasan pendidikan geometry pythagorean theorem symmetry fold symmetry simetri lipat simetri putar jangka line penggaris straighedge compass konsepsi siswa conception pokok bahasan pythagoras konsepsi smp teorema thales thales-theorem's proof populasi sampel isometri slope angle pythagorean-theorem's proof by president james a. president landasan ekonomi pendidikan ekonomi landasan ekonomi landasan the pythagorean theorem revisited equality area euclid area and equality landasan hukum pendidikan simetri sistem persamaan linier dua variabel