Question

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Answer 1

Square 's diagonal = Side *√2.
Side *√2=10√2
Side=10 cm.

Perimeter of square = 4 x side
                                  = 4 x 10
                                 = 40 cm.

Hope it helps u!!!!!!!!!

Answer 2

Ꮖ  ᎻϴᏢᎬ  ᏆͲ  ᎻᎬᏞᏢ  ᎽϴႮ.......