#1

the lengths of the sides of a triangle are 4, 5 and 6 cm.

part I

the largest angle is called T, symbol is theta

Q: find the cosine of T, as a fraction

this is not the problem, i have found that cosineT is 1/8

part II

hence show that sin T =

a√7 where a and b are integers and write down their values

___

b

probably pretty basic to some of you guys in college, but i totally lost concentration in class while teach was doing this.

EDIT: the a root 7 is over b, its a fraction, just not very clear

part I

the largest angle is called T, symbol is theta

Q: find the cosine of T, as a fraction

this is not the problem, i have found that cosineT is 1/8

part II

hence show that sin T =

a√7 where a and b are integers and write down their values

___

b

probably pretty basic to some of you guys in college, but i totally lost concentration in class while teach was doing this.

EDIT: the a root 7 is over b, its a fraction, just not very clear

*Last edited by munkymanmatt at Nov 18, 2008,*

#2

Tell your teacher that the big man says you dini need to know

sin T = a√7 where a and b are integers

in the real world!

sin T = a√7 where a and b are integers

in the real world!

#4

Try converting CosT to SinT, then arranging the equation into a quadratic.

#5

#6

Try converting CosT to SinT, then arranging the equation into a quadratic.

already tried that but i think thats not the way to go about it, i got sin T = 0.99(rounded)

so 0.99=a root 7/b

and i messed the equation around a little and got sqroot 7/0.99 = ab,

but i need a and b seperate