yes because it is of course a right angle
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No, An equilateral triangle has 3 congruent angles, an isosceles triangle has 2 congruent angles, a scalene triangle has no congruent angles.
No.
3
no triangle do not have four congruent angles
Not necessarily. The details are quite vague here since the question doesn't give the specific number of sides and angles.A triangle that has all congruent angles and sides is called an equilateral triangle.A triangle that has two congruent angles and two congruent sides is called an isosceles triangle.