Question

triangle ABC is an isosceles right angled triangle in which angle A is equals to 90 angle then find Angle B

Answer 1

Since angle A is equal to 90° and ABC is an isosceles triangle. AB=AC. Therefore angle B is equal to angle C. Thus
2 angle B= 180°-angle A
2 angle B=180°-90°
2 angle B=90°
angle B=90°/2
angle B= 45°