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12.1 introduction and the sum of angles of any triangle is equal to two right angles.परिचय र त्रिभुजका भित्री कोणहरुको योगफल दुई समकोण हुन्छ

12.2 exterior angles of a triangle is equal to sum of two opposite interior anglesत्रिभुजको एउटा भुजालाई लम्ब्याउदा बन्ने बाहिरी कोण दुई अनासन्न कोणहरुको योगफलसँग बराबर हुन्छ

12.3 the perpendicular drawn from the vertex of a isosceles traingle bisects the angle .समद्विबाहु त्रिभुजमा अाधारको लम्बार्धकले शीर्षकोणलाई अाधा गर्छ

12.4 condition for congruency & base angles of an isosceles triangles are equalअनुरुप हुने अवस्थाहरु र सहद्दिबाहु त्रिभुजका अाधारका कोणहरु बराबर हुन्छन्

12.5 sides opposite to equal angles of a triangle are equal & bisector theoremकुनै त्रिभुजका दुई कोणहरु बराबर छन् भने ती कोणका सम्मुख भुजाहरु बराबर हुन्छन् र समद्दिभाजन साध्य

12.6 mid-points of any two sides of a triangle is parallel to the third sideत्रिभुजको कुनै पनि दुई भुजाहरुको मध्यबिन्दु जोड्ने रेखा तेस्रो भुजासँग समानन्तर हु्न्छ

12.7 problems related to triangle theoremसम्बन्धी समस्याहरु

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