A coroner is an official who leads investigations into deaths in violent or suspicious conditions. It is not clear that there are any particular shapes that reduce their numbers.
If you meant corners, then in 2-dimensional space is any closed curve such as a circle, an ellipse, an oval or even an irregular shape have zero corners. These shapes have their 3 dimensional counterparts, also with no corners.
A circle, since it has 0 corners.
any ellipse (including any circle)
All of them apart from a circle
Yes
It is a square as square has 4 sides and all of them are equal. Also it has 4 corners.
As there are an infinite number of shapes, it is impossible to list the names of them all.
Zero isn't the smallest number, if a number at all. Negative numbers such as -4 are smaller.
Many shapes with three or more corners satisfy the condition. All triangles have 3 corners but not such that they are all equal. One which does is the equilateral triangle. A square and rectangle each have four corners, and by definition also have at least 3 equal corners. A trapezoid and parallelogram each has four corners but have pairs of obtuse and acute angles and so cannot satisfy the condition.
What is the smallest whole number you can add to 637 and get all 5's in the answer?
not all of them are. Round is an economical shape. Shapes with angles or corners wear faster and in the minting process are more difficult to place for stamping.
102 is the smallest three digit number with different digits.
12
All plane figures except circles have corners, and even that is debatable that circles have an infinite number of corners. Corners are simply where the line tracing the perimeter of the shape changes direction. Without any corners, you would have not have a convex figure. You would have a line. ■