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crayzwalz

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## Homework Statement

In the following diagram D and E are the midpoints of AB and AC. Use vector methods to prove that DE = 1/2BC

## Homework Equations

DE = 1/2 BC

## The Attempt at a Solution

AD = 1/2AB

AE = 1/2AC

AD + DE = AE

DE = -AE + AD

DE = -1/2AC + 1/2AD

IF BC = -AC + AB

AND DE = -1/2AC + 1/2AB

THEN 1/2BC = DE

Diagram -