b) 28º

c) 146º

2) D because the angles around a point must total 360°. Even though they don't look like the same sized angles, the diagram is not drawn to scale so we cannot use this as a reliable measure.

3) A because it is the only combination that creates a perfect straight line. The other combinations, therefore, must be greater or smaller than 180°.

2) B because these are the only angles positioned at the vertices of straight intersecting lines.

b) 50°

c) 65°

d) 80°

2) B because without the dotted line, this is just a quadrilateral. Both A and C's answers are convincing but the trapezium is one shape, not a triangle and rectangle combined.