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A mole of something contains 6.02214179×10^23 of them, so a stack of one mole of pennies would be: 6.02214179×10^23 x 1 mm = 6.02214179×10^23 mm high.
Regulation diminsions are 25.4 mm thick and 76.2 mm diameter.
It is 48.75 mm (1.92 inches) for US nickel 5-cent coins. US nickels are 1.95 mm thick. For Canadian nickels, the height is 44 mm (1.73 inches). Canadian nickels are only 1.76 mm thick.
Convert to the same units, then the comparison can be made: 1 in = 25.4 mm → 10 in = 10 × 25.4 mm = 254 mm 254 > 200 → 254 mm > 200 mm → 10 in > 200 mm 10 in is greater than 200 mm
If the shape is a triangle, then the area is approx 36.7 square mm.