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PQRS is a square whose side is 20 cm. By...

PQRS is a square whose side is 20 cm. By joining opposite vertices of PQRS are get four triangles. What is the sum of the perimeters of the four triangles?

A

`40sqrt(2)`

B

`80sqrt(2)+80`

C

`40sqrt(2)+40`

D

`40sqrt(2)+80`

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