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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13
flagRepublic of Ireland
11%
5%
76%
5%
17
flagAustralia
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72%
11%
18
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9%
71%
9%
21
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5780
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15%
39
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63%
17%
196
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flagthe United States
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10%
58%
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109
flagthe United Kingdom
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6%
57%
22%
77
flagIndia
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47%
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70