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circles don't have any characteristic's.
The answer depends on what characteristic of a half circle you want to calculate: its area or perimeter or something else.
No, a triangle is defined by its three sides and/or its angels. The diameter is a characteristic of a circle.
A decimetre is a metric unit for measuring distance. A diameter is a characteristic of a circle or similar shapes.
Are you kidding ? Neither of them belongs to this group.The circle is out because it's the only one in the group without straight sides.The square is out because it's the only one in the group with straight sides.