Can YOU answer these two 1957 O Level Maths Questions?

Mathematics O Level in 1957 consisted of four exam papers, each exam being at least 2 hours long.  Here is an example of a typical question from the 'Geometry' paper:

Here is an example of a typical question from the 'Algebra' paper:

These questions are the average standard of the questions on the paper - they seem really tough compared to today's equivalent exam!  There is interestingly a 'History of Mathematics' paper (I will put some of these questions on the blog later - but I probably won't answer them!).

CAN YOU ANSWER THESE O LEVEL QUESTIONS?