Which among the following angles cannot be constructed just by using a ruler and a compass?

30 degrees

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60 degrees

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70 degrees

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90 degrees

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Solution

The correct option is C
70 degrees

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 $70^{\circ}$ all other angles can be constructed using ruler and compass.

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