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My question: A homemade capacitor is assembled by placing two 9-in pie pans 5cm apart and connecting them to the opposite terminals of 9-V batter. Estimate the capacitance?

I know that to get the capacitance, you can use C=Q/V or C=keA/d. Do I need to find the area of the two pie pans to be help me solve the problem or do I make a triangle and find the area of that.

Thank You