Parallelogram perimeter

The ABC triangle with sides a = 5cm, b = 3cm, c = 40mm has the center of the sides of the K,L,M. How many cm have the KBLM parallelogram perimeter?

Correct result:

o =  9 cm

Solution:

a=5 cm b=3 cm c=40/10=4 cm o=a/2+c/2+a/2+c/2=5/2+4/2+5/2+4/2=9 cm



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