4 Ihisjide BIE DAL 7 12 18£ = GOV 7 M 69 =08V 7 ' 8E01 Ydlie ¥/—_�

1.	4 Ihisjide BIE DAL 7 12 18£ = GOV 7 M 69 =08V 7 ' 8E01 Ydlie ¥/—_—__—
Answer» In ∆ABC. ∠BAC + ∠ABC + ∠ACB = 180 degree [Sum of all the angles of a triangle is 180 degree ] ⇒ ∠BAC + 69 degree + 31 degree = 180 degree ⇒ ∠BAC + 100 degree = 180 degree ⇒ ∠BAC = 180 degree - 100 degree = 80 degree Now, ∠BDC = BAC = 80 degree .

4 Ihisjide BIE DAL 7 12 18£ = GOV 7 M 69 =08V 7 ' 8E01 Ydlie ¥/—_—__—

Answer»

In ∆ABC. ∠BAC + ∠ABC + ∠ACB = 180 degree

[Sum of all the angles of a triangle is 180 degree ]

⇒ ∠BAC + 69 degree + 31 degree = 180 degree

⇒ ∠BAC + 100 degree = 180 degree

⇒ ∠BAC = 180 degree - 100 degree = 80 degree

Now, ∠BDC = BAC = 80 degree .