Let, ∠ABC = 60°and CB be produced to the point D. Now, BX is a ray from B and the point X lies on that side of DC where A lies and ∠ABX ∶ ∠DBX = 5 ∶ 7. Draw the figure and then find (i) ∠CBX (ii) ∠DBX (iii) Reflex ∠ABX.
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Given : ∠ABC = 60°and CB be produced to the point D.
Now, BX is a ray from B and the point X lies on that side of DC where A lies and
∠ABX ∶ ∠DBX = 5 ∶ 7.
To find : (i) ∠CBX (ii) ∠DBX (iii) Reflex ∠ABX.
Solution:
∠ABC = 60°
CB be produced to the point D.
=> ∠ABC and ∠ABD form a linear pair
=> 60° + ∠ABD = 180°
=> ∠ABD = 120°
∠ABD = ∠ABX +∠DBX = 120°
∠ABX ∶ ∠DBX = 5 ∶ 7.
=> ∠ABX = 50° , ∠DBX = 70°
∠CBX = ∠ABC + ∠ABX
=> ∠CBX = 60° + 50° = 110°
Reflex ∠ABX. = 360° - ∠ABX = 360° - 50° = 310°
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