Answer:
Step-by-step explanation:
A straight line has 180 degrees.
43 + b + 50 = 180 Collect like terms
b + 93 = 180 Subtract 93
b = 180 - 93
b = 87
a + b + 75 = 180 All triangles have 180 degrees.
a + 87 + 75 = 180 Combine like terms
a + 162 = 180 Subtract 162 from both sides
a = 180 - 162
a = 18
