An envelope measures 6 cm by 8 cm.
The flap meets the envelope at the point M.
The point M is in the exact centre of the envelope.
A glue strip runs from D to M and M to C.
What is the length of the glue strip?
DC would be the hypotenuse of a right triangle.......and its length is given by :
sqrt(8^2 + 6^2) = sqrt(100) = 10 cm = DM + MC = length of glue strip
each glue strip is 5"
I can't see where your C and D points are, but it sounds like the glue strip halves the envelope into two halfs, hence we have:
6^2 + 8^2=H^2
H^2=100
H=Sqrt(100)
H=10 cm -being the length of the glue strip.
