There is no such concept in maths. A plane figure is a mathematical concept but that is not what the question is about.
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A plain figure is a simple figure.
figure math means figure math
A math concept is how you solve a math problem or the ideas. You usually have to memorize math concepts.
"key concept" is not a mathematical term . A key concept is an important idea. Two key concepts in math are derivatives and integrals of functions. ( "function" is also a key concept.)
30.00 - 14.53 = 15.47