Discussion
Which of the following statements is not correct ?
Answer: C
The incorrect statement is Two acute angles can be put together to make a reflex angle.
Each acute angle is less than 90°, so two together are less than 180°. A reflex angle is more than 180°, so two acute angles can never make one.
The other statements are correct. An acute and an obtuse angle can sum to exactly 180°, for example 60° and 120°, giving a straight angle. A reflex angle does lie between 180° and 360°. Two acute angles can exceed 90°, for example 50° and 60° make 110°, which is obtuse.
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