By using exterior angle theorem of triangle, Angle A is <A = [tex]47^{0}[/tex]
What is exterior angle theorem?
"If a side of a triangle is produced, then the exterior angle so formed is equal to the sum of the two interior opposite angles is known exterior angle theorem."
By using Exterior angle theorem
<A + <D = [tex]100^{0}[/tex]..............(1)
From the figure we can find <D
<D = [tex]180^{0}-127^{0}[/tex]
⇒ <D = [tex]53^{0}[/tex]
Substituting <D in equation (1)
<A + <D = [tex]100^{0}[/tex]
⇒ <A + [tex]53^{0} = 100^{0}[/tex]
⇒ <A = [tex]100^{0}-53^{0}[/tex]
⇒ <A = [tex]47^{0}[/tex]
From the straight line in the figure, we can write using exterior angle theorem
<A + <B = [tex]180^{0}[/tex]
⇒ <B = [tex]180^{0} -47^{0}[/tex]
⇒ <B = [tex]133^{0}[/tex]
Thus, By using exterior angle theorem of triangle, <A = [tex]47^{0}[/tex]
Learn more about exterior angle theorem here
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