Which of the following angles CANNOT be constructed by using ruler and

1.	Which of the following angles CANNOT be constructed by using ruler and compass only?
A.	\[{{30}^{o}}\]
B.	\[{{45}^{o}}\]
C.	\[{{70}^{o}}\]
D.	\[{{90}^{o}}\]
Answer» D. \[{{90}^{o}}\]

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Which of the following angles CANNOT be constructed by using ruler and compass only?

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