Question

in ΔABC, if m∠A + m∠B = 120, then m∠C =(a) 20
(b) 40
(c) 60
(d) 80

Answer 1

ANSWER
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TRIANGLE : A closed figure consisting of three sides and vertices. In other words , it is a polygon with three sides.

ANGLE SUM PROPERTY OF TRIANGLE
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Take any triangle from the world , the sum of the interior angles of the triangle will be 180°.

A.T.P.
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Angle A + Angle B = 120°

Therefore , m Angle C =

The equation formed :
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Angle A + Angle B + Angle C = 180 °

{ Angle sum property of triangle }

120° + Angle C = 180°

{ Putting the value of Angle A + Angle B = 120° }

Angle C = 180° - 120°

Angle C = 60°

ANS. Option ( c ) 60° is correct.

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