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2(a+b)=7.12 x=3.56 (a+b)+3.56=6.21 x=2.65 Diagonal is 2.65 m?

Sorry I'm a bit lost, I haven't had math for years, can you explain it a bit further?

The diagonal divides the parallelogram into two triangles, each triangle circumference is 6.21 m. The circumference of the parallelogram is 7.12 m. Calculate the diagonal length. I need tips how to solve this problem.