Answer:
x = 45
Step-by-step explanation:
We see that the triangle is both a right-angled triangle and an isoceles triange. This means that the three angles are:
a 90
b = c
c = b
We also know that the maximun amount of degrees in a Euclidean triangle is 180 degrees, so
2x = 180 - 90
180 - 90 = 90
90 = 2x
90 / 2 = 45
So, x = 45
