Find the measurement of ∠A from give figure.
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let the angle opposite to angle c (115) be x .
115°+ x = 180° ( linear pair )
x = 180°-115°
x = 65°
According to angle sum property sum of all interior angles of a triangle is 180°
so,
65°+65°+a = 180°
130° + a = 180°
a = 180°-130°
a = 50°
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