In a right-angled triangle ABC, angle A is 55 degrees, and C is 90 degrees. Find angle B.

Since, according to the condition, a triangle ABC is given, in which you should find out the value of one of the angles, you first need to remember the rule.
According to this rule, the sum of the values of all angles in any triangle is 180 °.
Now let’s write down for this triangle.
A + B + C = 180 °.
By condition, it is given that the angle A is 55 degrees, and the angle C is 90 degrees.
Now we will find the angle B.
A + B + C = 180 °.
55 ° + B + 90 ° = 180 °.
145 ° + B = 180 °.
B = 180 ° – 145 °.
B = 35 °.
Answer: B = 35 °.