The Midline Theorem

In ∆SIE, L and D are the midpoints of SI and IE respectively. If LD is 12, then what is the value of SE?

In ∆SIE, L and D are the midpoints of SI and IE respectively. If LI = 18, what is the value of LS?

In ∆SIE, L and D are the midpoints of SI and IE respectively. If LS = 6, ID = 8, and SE = 10, find the perimeter of ∆SIE.

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