The complement of the triangle in the plane.
A plane triangle looks like a common triangle. A plane triangle is solved with linear units. A spherical triangle is found inside of a sphere. This type of triangle is solved with angular units.
Triangle Plane Square
It is a triangle
No- a triangle is a plane figure, not a solid.
A triangle is a plane figure and as such has no volume
No, never in plane geometry.
A triangle. The effect of turning will depend on whether the plane containing the triangle is rotated - that is, the triangle is rotated around an axis perpendicular to its plane. In that case, it will appear upside down. Alternatively, it can be rotated about an axis in the plane of the triangle. In this case it will appear flipped.
In Euclidean plane geometry every triangle MUST BE coplanar.
There are 180 degrees in every plane triangle.
Every point in the plane outside the triangle can fall there!