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A regular 18-sided polygon is rotated with the center of rotation at its center. What is the smallest degree of rotation needed to map the polygon back on to itself? Is it 180 degrees or 20 degrees? Or
asked
Mar 19, 2018
Mathematics
high-school
1
answer
4
votes
112k
views
The study of how and why the number of individuals in a group of animals changes over time is called
asked
Feb 17, 2018
Biology
high-school
1
answer
4
votes
144k
views
The measure of the energy of motion of particles of matter
asked
Jan 17, 2017
Chemistry
middle-school
1
answer
3
votes
88.2k
views
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