Solution :
Let us assume the third angle as a
So, as we know that
116° + a = 180° [Reason : Linear Pair]
a = 180° - 116°
a = 64°
Now, according to the question, we need to find x
So,
53° + a + x = 180° [Reason : Three angles of a ∆ = 180°]
Putting a's value we get
53° + 64° + x = 180°
117° + x = 180°
x = 180° - 117°
x = 63°
