Answer:
Last one.
Explanation:
is used in 30-60-90 triangles
is used in 45-45-90 triangles
Base is x, leg is x, hypotenuse is 2x
x = 20 ; y= 10√3
30, 60 , 90 triangle ratio is
Side opposite to 30 is a
a = AC = 10
Side opposite to 60 is a
AB = a = 10√3
Side opposite to 90 is 2a
BC = 2a = 2* 10 = 20
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