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What is x in this figure?
"
Given: The 2 exterior angles of a triangle are 125o.
To find: We have to find the value of the other exterior angle x.
Solution:
Now,
∠1 + 125o = 180o (Linear pair of angles)
∠1 = 180o - 125o = 55o .....(i)
∠2 + 125o = 180o (Linear pair of angles)
∠2 = 180o - 125o = 55o .....(ii)
∠3 + xo = 180o (Linear pair of angles)
∠3 = 180o - xo .....(iii)
and,
∠1 + ∠2 + ∠3 = 180o (Sum of interior angles of a triangle)
Sustitute values from eq. (i), (ii) and (iii):
55o + 55o + 180o - xo = 180o
xo = 55o + 55o + 180o - 180o
xo = 110o
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