PQRS is 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. $$ {40{ sqrt{2}}}$$
• B. $$ {40{ sqrt{2}}}+ 40 $$
• C. $$ {40{ sqrt{2}}}+ 80 $$
• D. $$ {80{ sqrt{2}}}+ 80 $$