Answer:
27 degrees
Explanation:
A right angled triangle has 1 angle as 90 degree. And as you know the other angle is 63 degree, and the angle sum property of a triangle is 180 degrees. So- 
Let's take 'x' as the other angle. 
90 + 63 + x = 180
153 + x = 180
x = 180 - 153 = 27
x = 27 degrees
So, the other angle is 27 degrees. 
All the angles of the right-angled triangle are- 90, 63, 27.