No.
no it isnt
|\ |_\ right-angled triangle
If by regular, you're referring to a regular polygon which has all sides equal length, and all angles equal, then an equilateral triangle is a regular triangle. If you draw a scalene triangle or an isosceles triangle then it will not be equilateral.
All right-angled triangles are scalene with the sole exception of the 90-45-45 shape.
No, it is not.
It is possible.
It will be a right angled triangle with angles of 90, 72 and 18 degrees.
yes it is possible to do that.
no
Yes!
No
It will have 3 lines of different lengths and is classed as a scalene triangle.