Respuesta :
Sum measure interior angle = (n-2)180 ; n is the no.of sides
=(3-2)180
= 180°
53+59+x = 180
111+x = 180
x = 180-111
x = 69°
Angle B is 69°
Please give brainliest
Answer:
69°
Step-by-step explanation:
A + B + C = 180°
53° + B + 58° = 180°
B + 111° = 180°
B = 69°