geometry
posted by sreve .
the perimeter of triangle ABC is 21 units. Give the perimeter of the triangle formed by its midsegments (connecting midpoints of all sides).

Connecting the midpoints of the triangle sides creates a triangle with sides of half the lengths of the given triange making the perimeter 10.5.

Two sides of a triangle ABC have lengths 7cm and 9cm. Which of the following could not be the length of triangle ABC's third side
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