Mathematics
Which of the following angles cannot be constructed using ruler and compass?
15°
45°
75°
85°
Answer
Using ruler and compass, we can construct angles of 60°, 90° and their bisectors. Angles such as 15°, 30°, 45°, 75°, etc., can be constructed by repeatedly bisecting or by adding/subtracting these standard angles. However, 85° cannot be constructed using only a ruler and compass.
Hence, option 4 is the correct option.
Related Questions
The instrument in a geometry box having the shape of a semicircle is:
ruler
divider
compass
protractor
The instrument used to measure an angle is:
ruler
protractor
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compass
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2
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infinitely many
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0
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infinitely many