No. A triangle is a two-dimensional object, therefore it is not three-dimensional.
it is a 3 dimentional triangle ... it can be a pyramid with 5 sides ... or one with four sides
It is impossible to have a triangle with 3 right angles. It is possible to draw a triangle with three right angles on the surface of a sphere: www.metacafe.com/watch/769025/270_degree_triangle_yes_3_right_angles
No.
Oh you know, the 3-dimentional triangle type.
No it's not possible. The triangle with the most lines of symmetry is Isosceles triangle and that has 3 lines of symmetry. Unless you draw on the back, but that isn't correct.
No because the 3 sides of an equilateral triangle are equal in length
No because an equilateral triangle has 3 equal acute angles of 60 degrees
You cannot. An equilateral triangle has 3 lines of symmetry, an isosceles has one and a scalene none. So there is no triangle with two lines of symmetry. Of course, you could draw only two of the three possible lines of symmetry for an equilateral triangle.
No. In order for any three line segments to form a triangle, none of them can be greater in length than the sum of the other two.
It will have 3 lines of different lengths and is classed as a scalene triangle.
square
No, a triangle consists of 3 sides, thus "tri"