A right angle triangle is made up of one 90 degree angle and two acute angles and the three angles add up to 180 degrees.
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If you mean angles then it is a right angle triangle or an isosceles right angle triangle
A right triangle. Also an isosceles triangle.
You can measure it with a ruler.
Yes in a 90 45 45 triangle
If it has no right angles, it is not a right triangle and therefore you cannot name a hypotenuse of that triangle. Which implies you cannot find that side's measure.