The length of the diagonals of a rhombus is 40 cm and 60 cm. What is the length of the side of the rhombus ?

$10\sqrt{13}$ cm

The length of the diagonals of the rhombus = 40cm and 60 cm

Then the length of the rhombus = \(\sqrt { (\frac{d1}{2})^2 + (\frac{d2}{2})^2 }\)

= \(\sqrt { (\frac{40}{2})^2 + (\frac{60}{2})^2 }\)

= \(\sqrt { 400 + 900 }\)

= \(\sqrt { 400 + 900 }\) = $10\sqrt{13}$ cm