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Answer:
Area of ABD = 9/2 or 4.5cm^2
Step-by-step explanation:
Area of triangle =
[tex] \frac{bh}{2} [/tex]
plug-in ABD
[tex] \frac{3 \times 3}{2} [/tex]
[tex] \frac{9}{2} [/tex]
Area of ABD = 9/2 or 4.5cm^2