Question

In the right triangle ABC, angle C equals 90 degrees. If angle B is 63 degrees, what is the measure of angle A?

Answer 1

The internal angles of a triangle have to sum 180 degrees.
So A+B+C=180 degrees
if C=90 and B=63 then
A+63+90=180
A+153=180
A=180-153=47
So A has to measure 47 degrees.