Figure shows a 240-QAM signal constellation, which may be viewed

Figure shows a 240-QAM signal constellation, which may be viewed as an extended form of QAM cross constellation.
(a) Identify the portion of Figure that is a QAM square constellation,.
(b) Build on part (a) to identify the portion of Figure that is a QAM cross cons te11ato n.
(c) Hence, identify the portion of Figure that is an extension to QAM crossconstellation.