# <span lang="EN-US

Let us name the different coordinate in the above question figure: CBI + CBA = 180° (linear pair of angles at a vertex)

105° + CBA = 180°

CBA = 180° - 105°

CBA = 65°

BAH + BAC = 180° (linear pair of angles at a vertex)

BAH + 35° = 180°

BAH = 180° - 35°

BAH = 145°

In Δ ABC,

A + B + C = 180° (Sum of the angles of triangle is 180°)

35° + 65° + C = 180°

100° + C = 180°

C = 180° - 100°

C = 80°

ACB + ACJ = 180° (linear pair of angles at a vertex)

80° + ACJ = 180°

ACJ = 180° - 80°

ACJ = 140°

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