凹おう角かくおうかくMeanings1nounconcave angle; re-entrant anglemathematicsA mathematical term for an angle greater than 180 degrees and less than 360 degrees. Used in geometry.凹おう角かくは180度どより大おおきく360度どより小ちいさい角かくです。A concave angle is an angle greater than 180 degrees and less than 360 degrees.
