A triangle is the 2D name of a certain shape. A triangle has three sides and, in the case of a right angled triangle, has an angle of 90 degrees in one corner. There are many other names depending on the angles used.
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What is the Angle relationship?
right angle triangle
a scalene triangle
45 degrees is an angle, not a triangle.A triangle containing an angle of 45 degrees can be any kind of triangle except an equilateral triangle.
Either a scalene triangle or an isosceles triangle.
It doesn't ever fall outside of a triangle.