What is the shape of the piston in the Wankel engine?

circular
rectangular
triangular
oval
In this engine the pistol has a triangular shape (Reuleaux triangle with a slightly convex edges).
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flagVatican City
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100%
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flagRepublic of Ireland
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5%
76%
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17
flagSwitzerland
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72%
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22
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203
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11
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114
flagthe United Kingdom
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flagIndia
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70