# Q9 Plz ans fast Q.9. The side of a square is 25 cm. Find the length of its diagonal correct to 2 decimal places.

Dear Student,

$A{C}^{2}=A{B}^{2}+B{C}^{2}\phantom{\rule{0ex}{0ex}}⇒A{C}^{2}={25}^{2}+{25}^{2}\phantom{\rule{0ex}{0ex}}⇒A{C}^{2}=625+625\phantom{\rule{0ex}{0ex}}⇒A{C}^{2}=1250\phantom{\rule{0ex}{0ex}}⇒AC=35.35$

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