Question 1063277
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In a triangle ABC, DE is a parallel to BC and D is the mid point of side AB. 
Find the perimeter of a triangle ABC when AE =4.5 cm , DE = 5 cm and DB = 3.5 cm
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<pre>
AC is AE doubled.

AB is DB doubled.

BC is DE doubled.
</pre>

On mid-line of a triangle see the lesson

&nbsp;&nbsp;&nbsp;&nbsp;- <A HREF=http://www.algebra.com/algebra/homework/Triangles/The-line-segment-joining-the-midpoints-of-two-sides-of-a-triangle.lesson>The line segment joining the midpoints of two sides of a triangle</A>

in this site.