shrive555 wrote:

If B is the midpoint of AC, what is the length of BE?

(1) Angel BAE=30

(2) CD = \sqrt{20}

why 1 isn't enough ?

Triangles ABE and ACD are similar (because all corresponding angles are equal)

Since AB is 1/2 of AC, length of BE will be half of length of CD. To know the length of BE, you only need the length of CD.

Knowing only the angle BAE doesn't help because we do not have the length of any side available.

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