Math workbook seventh grade second volume answer

1.a point coordinates (4,3)

2. Make perpendicular lines of Y axis and X axis through point A and point C respectively, and the two perpendicular lines intersect with d; Make a vertical line of AD and CD through point B, and intersect AD and CD at points E and F. ..

According to the figure, AD=CD=5, AE=CF=3, BE=ED=DF=FB=2.

△ABC area =△ area =△ACD-EBFD square area -△ABE area -△BCF area.

=5*5/2-2*2-2*3/2-2*3/2=2.5

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