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Step-by-step explanation:
[tex]h = \frac{3}{4} 4.8 \ = \\ = 3 \times 1.2 = 3.6[/tex]
[tex]area = \frac{3.6 \times 4.8}{2} = \\ = 3.6 \times 2.4 = \\ = 8.64[/tex]