In a triangle ∆ABC
<A + <B + <C =180°(Angle sum property)
<A+<C=40°+60°=100°
Now
<C=180°-100°=80°
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Step-by-step explanation:
In a Euclidean space, the sum of angles of a triangle equals the straight angle (180 degrees, π radians, two right angles, or a half-turn). A triangle has three angles, one at each vertex, bounded by a pair of adjacent sides.
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