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wait.. i'm going to analyze it first

the first might be 2 sqrt 3
the second..hmm can i see your workings?

aaaawwww.. i was wrong.... what i did was the 30-60-90 angles, but it should be 45-45-90.. right?

yup! :)

why 2 sqrt 3 ?? i got 2 sqrt 2

4 tan 45 = 4
4 sin 60 = 2 sqrt 3?

i don't get it T.T

It's the first pic. It means that the plane A is at angle of 60 with B

And on the plane A there is a isoscles right angle triangle.

|dw:1353387385535:dw|
is it like this?? sorry for the drawing

Nice drawing. |dw:1353330325620:dw|

is that the right position of the isosceles triangle?

Yup. Since the "the hypotenuse of the triangle lies in plane B"

and where is the 60 degree angle??
sorry if i have so many questions

|dw:1353330869441:dw|
lol dun worry about it

|dw:1353330892217:dw|

where does projection of each leg of the triangle refers to??

atlast i got it.. ahhaa.. thanks for the help!