it can have 1 if it is a right triangle.
a triangle
4
A 2D triangle is simply referred to as a "triangle." It is a geometric shape with three sides and three angles. Triangles can be classified based on their side lengths (such as equilateral, isosceles, and scalene) or their angle measures (such as acute, right, and obtuse).
An equilateral triangle.
A triangle is the 2D name of a certain shape. A triangle has three sides and, in the case of a right angled triangle, has an angle of 90 degrees in one corner. There are many other names depending on the angles used.
An equilateral triangle.
A cyclic kite. A kite is cyclic if it has only two right angles.
square
A square
a square
3d not = to 2d
No