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 mid-points 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