53.34 cm²
1) To find out the area of the base of that prism, we'll make use of a formula
2) Since we have a rectangle whose dimensions are 3cm and 7 inches we can plug into that formula. Not without converting those dimensions before that
inch ------------ cm
1 2.54
7----------------- x
x= 7 *2.54
x = 17.78 cm
3) Now we can plug that into the Area of a rectangle formula:
[tex]\begin{gathered} A=17.78\cdot3 \\ A=53.34\operatorname{cm} \end{gathered}[/tex]
Hence, the area of that base is 53.34 cm²
