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a)angle sum property of quadrilateral =360
45+75+100+CBA=360
220+CBA=360
CBA=140
x=180-CBA
=180-140
=40
b)angle sum property of Pentagon =540
2x+7x+3x+5x+x=540
18x=540
x=540/18
x=30
45+75+100+CBA=360
220+CBA=360
CBA=140
x=180-CBA
=180-140
=40
b)angle sum property of Pentagon =540
2x+7x+3x+5x+x=540
18x=540
x=540/18
x=30
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