HELP HSC 2002 Q27a (2 Viewers)

[80percent]

hey, i got no idea how to get the angles inside the triangle... i thought i knew bearings :s ...some1 help explain how to get the angles please

 

[loki]

 

[chocobo]

27ai) find the size of /_XYZ 90+46=136

just imagine a straight line from Y and it looks like a 90 degree angle add that to 46 and presto!

ii)Cosine rule!! C2=a2+b2-2ab cos c

a=18
b=22
c=136 degrees

iii)180+46=226

draw a straight line on the Z and u see 180 degrees the angle inbeteen that and the tip of the triangle is 46 degrees!

hope that helps

 

[loki]

did you get that from Success one Chocobo? coz i dunno if my answer is right...

 

[chocobo]

Nah man

its another book thats got past papers and specimen papers.....its a purple book all its got att the front is General mathematics.....

got some worked answers too its good! i got it for 15 bucks