Please help on mathswatch test :)
Question attatched below:

Step-by-step explanation:

So,

Angle e = Angle a, as they are alternate angles

Angle f = Angle c, as they are alternate angles

Angles a, b, and c all add up to 180° as they are all on a straight line (straight lines qual 180 degrees)

So, therefore, angles e, f and b all add up to 180° because all triangles equal up to 180 degrees in side