Mathematics Cambridge 3u year 11 help exercise 4B (1 Viewer)

[plutonium-238]

Can someone please show me how you do question 8b and 10? THANKS!!

 

[Shazia25]

hahhah lol.... I would..... but I have a different textbook
im doing 3U too... hang in there!
p.s im new... how do u make a signature at the bottom of ur reply thing?

 

[Shazia25]

I only just realised u uploaded a pic... I still cant do that question... sorry...

 

[Drongoski]

Q10

Drop a perpendicular from C to PB; let the foot of this perpendicular be R

Now use this simple fact: if you have a right-angled triangle, hypotenuse of length 'h', with one angle @.
Then the 2 sides: one opp the angle @ and the other adjacent have lengths immediately:
h sin@ and h cos@ respectively.

Now angle CBR = angle PAB = @

Using this fact: AP = x cos @ and PQ = CR = y sin@

.: AQ = AP + PQ = x cos@ + y sin@