A surveyor in Bridgetown, Barbados, measures the angles where three roads meet at a junction. If two of the angles measure 85° and 120°, what is the measure of the third angle at the junction?

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Question

A surveyor in Bridgetown, Barbados, measures the angles where three roads meet at a junction. If two of the angles measure 85° and 120°, what is the measure of the third angle at the junction?

Accepted Answer

155° — Award 1 mark for correct calculation. Angles at a point sum to 360°. Third angle = 360° - 85° - 120° = 155°. B is incorrect (adds instead of subtracts). C is incorrect (finds 180° - 120° - 5°, confusing angle properties). D is incorrect (miscalculation or confusion with supplementary angles).

Answer

205°

Answer

55°

Answer

135°

Answer

155°

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