It's impossible.
no
A triangle on a concave surface.
an iscoceles triangle
Nope - because the internal angles of a triangle must total 180 degrees !
Yes, a triangle is always concave. * * * * * How wrong can you get! A triangle is always convex and NEVER concave.
It is possible.
yes it is possible to do that.
Yes!
no
No
No it is not possible to draw 1 triangle with 2 right angles because the angles in a triangle should equal to 180 degrees
No, you would need at least 4 points to create a concave polygon.
Yes
No.
No
Yes.