Thread: Addition formulae

With question 1 I have guessed the unknown side lengths using common pythagorean triples. Is there another way to get them?

I have done 2a. Can I have a clue for 2b? I expect it uses addition formulae.

Originally Posted by Stuck Man

With question 1 I have guessed the unknown side lengths using common pythagorean triples. Is there another way to get them?

I have done 2a. Can I have a clue for 2b? I expect it uses addition formulae.

2(b) can be calculated using

given that and

and and

Thanks. I copied the diagram for question 1 and missed the length of QP so theres no need to reply to that now.