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समान्तर चतुर्भुज का एक अन्तः कोण 30° है। शेष कोणों के मान ज्ञात कीजिए।

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समान्तर चतुर्भुज के सम्मुख कोण बराबर होते हैं।

माना शेष दोनों सम्मुख कोण = x°

समान्तर चतुर्भुज का एक अन्त: कोण = 30°

इसका सम्मुख कोण = 30°

हम जानते हैं कि x° + x° + 30° + 30° = 360°

⇒ 2x° + 60° = 360°

⇒ 2x° = 360° – 60°= 300°

⇒ x° = 300/2 = 150°

अतः शेष कोण = 30°, 150°, 150°

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