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?

`40sqrt(2)cm`

`(80sqrt(2) + 80) cm`

`(40sqrt(2) + 40) cm`

`(40sqrt(2) + 80) cm`

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