The degrees of unknown angles on triangles are represented by thieta, the symbol for which looks like a 0 with a line through it. The degrees of a triangles angles all add up to 180 degress.
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90 degrees
There are 3 angles in a triangle that add up to 180 degrees.
Because a triangle is half of a square or rectangle. Since there are 360 degrees in all the angles of a square, there will be 180 degrees in a triangle.
The third angle must be 90 degrees so it's a right-angled triangle
A triangle has three angles, not "angels." The sum of the angles will equal one hundred eighty degree. An equilateral triangle has three equal angles all measuring sixty degrees.