Q. 1 C5.0( 1 Vote )

# Choose the correct answer:The three exterior angles of a triangle are 130°, 140°, x° then x° isA. 90°B. 100°C. 110°D. 120°

Angle Sum Property = A + B + C = 180°[T1]

DAC = 130° and ABE = 140°

DAC + DAB = 180° (sum of the angle on a straight line at point is 180°)

DAB = 180° - DAC

DAB = 180° - 130° = 50°

Similarly,

ABE + ABD = 180° (sum of the angle on a straight line at point is 180°)

ABD = 180° - ABE

DAB = 180° - 140° = 60°

BDB’ = DAB + DBA

(if a side of a triangle is produced, the exterior angle so formed, is equal to the sum of the two interior opposite angles)

x° = 50° + 60° = 110°

Hence, option C is correct.

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