Answer:
NB = 75
Angle N = 81
Step-by-step explanation:
The triangle is isosceles, which means NC and BC are equal.
(2x + 90) + (2x + 90) + x = 555
5x + 180 = 555
5x = 375
x = 75
So NB = 75
If two sides are equal, that means the angles are equal too. So angle N is equal to angle B.
A triangle has 180 degrees.
Let n represent angle N and angle B
18 + n + n = 180
2n = 162
n = 81
