👉 In geometry, a placoidean is a type of triangle that has one angle measuring 60 degrees. A placoidean triangle is also known as a pentagonal triangle. The sum of the interior angles of a regular n-sided polygon with each side of length s is given by (n-2)
s^2, where s is the length of one side. In this case, since the angle at vertex C measures 60 degrees, we can use the formula to
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