Hey I came across this question 2aii in Jan 2012 C4 and the mark scheme wants me to use pythagoras but how do I do that if the angle is obtuse by pythagoras I could calculate the actute angle which would be (1/sqrt(3)) but then hwo would I find the obtuse one from that which is -1/sqrt(3). I just did sin inverse 0.5 then found the obtuse angle 180-30 and then 'tan'ed that. But the mark scheme wangs use of pythagoras... My working and the mark scheme and the question have been attached. Thanks. Btw I got this exam tomorrow AQA . The question is 2a ii btw
It tells you in the question that angle B is obtuse, tan of an obtuse angle is negative which is why the answer is negative ie -1/sqrt(3)
Thanks for posting! You just need to create an account in order to submit the post
Already a member?
Oops, something wasn't right
please check the following:
Not got an account?
Sign up now
© Copyright The Student Room 2015 all rights reserved
The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.
Register Number: 04666380 (England and Wales), VAT No. 806 8067 22
Registered Office: International House, Queens Road, Brighton, BN1 3XE