Whats area of 2 cm 5 cm 6 cm

You are making a battery for a science project. you have copper wire for your first electrode. you need to choose a conductor, a second electrode, and a device to plug into your battery. you have already chosen a lemon conductor. complete each statement below about the options that include a lemon conductor.

How do i do this activity, is appreciated

Given abcd ac=38 and ae=3x+4 find the value of x