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I will base the answer on the assumption you mean the 12-sided 50-cent coin.
A first approximation will assume that the coin is round, and use half a line that connects two opposing vertices as the diameter d, and then the area is pi*d^2/4. The diameter being 31.51 mm, we get 7.79 cm2 A more accurate answer will consider the coin as a regular dodecagon, that is 12 isosceles triangles whose long side's length is the circle's radius i.e. 15.25 mm, and each have a top angle of 360/12 degrees = 30 degrees. The formula in the links gives here
3*d^2/4 = 7.4466 cm2
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The Australian 20 cent coin features a platypus on the reverse.
What do you call a five cent coin?
A five cent coin is generally called a nickel.
What four coins equal 80 cents?
A 50 cent coin and three 10 cent coins.A 50 cent coin, a 20 cent coin and two 5 cent coins.Four 20 cent coins.
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Lincoln is on the 1 cent coin
