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Mathematics for IGCSE & O level - Geometrical Constructions (Section 2 - No. 7)
How do you measure angle A (obtuse) if you know it's reflex angle is 35°?
35°
145°
325°
215°
解释
Angle A = 360-35 = 325° (wrong answer) OR Angle A = 180 - (35-90) = 145
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