The shape identified by three noncollinear points.
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No, a triangle is defined by its three sides and/or its angels. The diameter is a characteristic of a circle.
He defined the spherical triangle
In a right triangle, the cosine of an angle is defined as the ratio of the adjacent side of that angle to the hypotenuse.
No, it is not a type of triangle as a triangle is defined as a polygon with three sides and three angles and a parallelogram has four sides and four angles.
An isosceles triangle is defined as a triangle that has two sides of the same length. With two identical right triangles, it is possible to arrange them into a bigger triangle that has two sides that are the same length.