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Isosceles right triangle

triangle in which one angle is a 90-degree angle and two sides are congruent

Pronunciation
/aɪˈsɑsəˌliz raɪt ˈtraɪˌæŋɡəl/
/ʌɪˈsɒsɪliːz rʌɪt ˈtrʌɪaŋɡəl/