Answer:
when you see 30 60 90 trangle always remembee this important information
30 degree meet x
90 degree meet 2x
60 degree meet xsqrt3
for example if we Saw the 90 degree meet 4 and unknown degree meet 2 we have to know that unknown degree is 30 hopefully you can understand what iam saying because my engilish begin come bad when i explain any thing
