Any triangle with a 90 degree angle is a right triangle.
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The best way to find the length of a right triangle is to use the Pythagorean Theorem. The answer would be A = 3.
either a right angle or a acute angle it depends what way you turn the triangle
If it's a right triangle, then one.There is no other way to have a perpendicular angle in a triangle without it being 90 degrees, or right.
An obtuse triangle has one angle greater than 90 degrees and a right triangle has one angle exactly 90 degrees.
They have [at least] two acute angles.