पाइथागोरस प्रमेय, गणित, ब्लैक बोर्ड, सूत्र, मंडल, चाक, चॉकबोर्ड, पाइथागोरस, ज्यामिति, त्रिकोण, कोण
Public Domain
प्रासंगिक तस्वीरें
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