Stage 8 - Q6 - 4 marks
18092
The top line is parallel to AB. Find angle B and explain how the parallel line justifies the triangle angle sum.
A
B
C
\(58^{\circ}\)
\(48^{\circ}\)
\(a\)
\(b\)
Top line is parallel to AB
Hint
Write a short equality together with the geometric fact that justifies it.