An upside-down triangle. It does not matter from which direction you view a triangle, it will still be a triangle.
a scalene triangle
a congruent triangle?
iscosoles triangle
This side is called the hypotenuse.
There is no specific name because there is no specific shape. The shape could have anything from 5 to 13 sides depending on the sizes and orientations of the triangle and square.
The straight line does not have a specific name.
A quadrilateral with a triangle attached to a square can simply be referred to as a "square with a triangle." However, if you want a more specific geometric term, it could be called a "trapezoid" if the triangle is positioned such that one of its sides is parallel to one side of the square. The exact name might vary based on the configuration of the triangle and square.
a triangle
Triangle A is the only possible name from the information provided.
A triangle.
A triangle with a square base is not a standard geometric term, but it can be described as a triangular prism if referring to a three-dimensional shape with a triangular top and a square base. If you mean a two-dimensional figure, it might be more accurately described as a right triangle or an isosceles triangle depending on the specific dimensions and angles. In general, the combination of a triangle and a square base does not have a specific name.
Another name is its correct name: an isosceles triangle.
Tri means three, and there are three angles to a triangle so that's how the triangle got its name.
Triangle
Equilateral triangle, regular triangle.
right triangle