plane geometry
noun
: a branch of elementary geometry that deals with plane figures
Example Sentences
Recent Examples on the Web All this talk of plane geometry is hard to visualize, so L’Engle’s 1962 novel comes complete with a diagram. 
refinery29.com, 7 Mar. 2018
refinery29.com, 7 Mar. 2018 Word History
First Known Use
1747, in the meaning defined above
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