Discussion
Which of the following statements is not true ?
Answer: A
The statement that is not true is sum of two acute angles can be equal to a straight angle.
An acute angle is less than 90°, so two acute angles together are always less than 180°. A straight angle is exactly 180°, so two acute angles can never make one.
The other statements are possible. Two acute angles can make a right angle (40° + 50° = 90°) or an obtuse angle (60° + 70° = 130°). An acute and an obtuse angle can make a straight angle (60° + 120° = 180°), as the angles in a linear pair often do.
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