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Question
Which among the following angles cannot be constructed just by using a ruler and a compass?
Options:
A .  30 degrees
B .  60 degrees
C .  70 degrees
D .  90 degrees
Answer: Option C
:
C
All the standard angles and the angles which can be obtained by bisecting standard angles can be constructed just by using a ruler and compass. Here except 70 all other angles can be constructed using ruler and compass.

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