Answer:
60°
Step-by-step explanation:
outside angle = two opposite inside angles
10x - 45° = 4x + 3x
3x = 45°
x = 15°
m∠B = 4x
m∠B = 4(15°)
m∠B = 60°
1026.02, you can round that online
non - collinear points
points that dont lie on the same line
